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  • 1
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    Soviet short-term forecasts of active region evolution and flare activity (1979)
    In:  CASI
    Details
    Publikationsdatum: 2009-11-16
    Beschreibung: The structure and strength of the magnetic fields of the Sun's active regions were studied to obtain information for short term forecasting. Intensity forecasts were then made using the information obtained on the gradients of the magnetic fields between sunspots of opposite polarity. A comparison of flare forecasting methods is presented.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 72-88
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  • 2
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    MSFC solar activity predictions for satellite orbital lifetime estimation (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: The procedure to predict solar activity indexes for use in upper atmosphere density models is given together with an example of the performance. The prediction procedure employs a least square linear regression model to generate the predicted smoothed vinculum R sub 13 and geomagnetic vinculum A sub p(13) values. Linear regression equations are then employed to compute corresponding vinculum F sub 10.7(13) solar flux values from the predicted vinculum R sub 13 values. The output is issued principally for satellite orbital lifetime estimations.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 378-384
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  • 3
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    Coronal holes inferred from the Fleurs East-West solar scans (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: East-West solar scans produced daily on 692 and 1415 MHz are analyzed for the period 1968 to 1973. The analysis confirms that coronal holes are stable features displaying significantly reduced electromagnetic emission which can persist for many solar rotations. The coronal hole observations are summarized in a series of tables.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 288-311
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  • 4
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    A review of short-term flare forecasting activities at Toyokawa (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Short-term forecasting of solar activity conducted at Toyokawa is briefly reviewed. The forecasts are based on microwave observations of the slowly varying component of solar radiation associated with active regions. It was found that for proton flares which take place in intense active regions, it is possible to predict their occurrence with certain accuracy, but for a certain class of proton flares which occur in a small active region or which are associated with an active region, which evolves very rapidly, or for whose which occur behind the limb, it is almost impossible to forecast their occurrence.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 205-211
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  • 5
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    Solar activity predictions at Peking Observatory (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Solar activity prediction procedures used at the Peking Observatory are briefly reviewed. Methods for short term prediction of solar proton events and the results for proton events of importance greater than 1 during the period 1974-1977 are given in detail. The characteristic values of solar cycle 21 are predicted.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 154-162
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  • 6
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    Forecasting of solar energetic radiation at the forecast center of the Institute of Applied Geophysics (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Solar energetic radiation forecasting techniques are described. The factors that are used as the basis for the forecasts are discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 89-103
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  • 7
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    Executive summary of Aircraft Icing Specialists Workshop (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: In a period of escalating development costs for new aircraft, there is growing interest in a renewed and coordinated icing research effort to achieve an updating or modernization of each aspect of the technological issues that are involved. This includes the data base, analysis methods, test techniques, and test facilities.
    Schlagwort(e): AERODYNAMICS
    Materialart: Aircraft Icing; p 1-16
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  • 8
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    Safety hazard of aircraft icing (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: The problem of aircraft icing is reported as well as the type of aircraft affected, the pilots involved, and an identification of the areas where reduction in icing accidents are readily accomplished.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 21-27
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  • 9
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    Solar forecast and real-time monitoring needs of the Study of Energy Release in Flares (SERF) (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Complementary, simultaneous observations of flares from as many observatories, both ground based and orbiting, as possible planned for the Solar Maximum Year are considered. The need for forecasts of solar activity on long term, one week, and two day intervals is described. Real time reporting is not needed, but daily summaries of activity and permanent records are important.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 331-339
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  • 10
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    The variability of the solar ultraviolet spectral irradiances (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Available data on the solar spectral irradiances at wavelengths below 3100 A are extremely limited and there are major uncertainties in many of the measurements. In particular, there is major disagreement on the magnitude of the variability of the spectral irradiances over the solar cycle. The effects of different solar features on the ultraviolet spectral irradiances over both the 28 day solar rotation period and over the solar cycle are discussed. It is proposed that any attempt to predict the magnitudes of the ultraviolet spectral irradiances must take into account a long term variability of emission from quiet regions of the solar disk over the solar cycle. The need for direct long term monitoring of the ultraviolet spectral irradiances is emphasized.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 280-321
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  • 11
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    A new method of very long-term prediction of solar activity (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: A method of solar activity prediction based on the statistical relationship between the minimum value of geomagnetic activity in each 11 year cycle and the height of the next sunspot cycle is proposed. The method is applied to predict sunspot cycle 21.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 258-263
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  • 12
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    The needs for prediction and real-time monitoring for the flare build-up study (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Similarities between plasma instabilities occurring in the magnetospheric tail and in active regions on the Sun are discussed. Intense observations of the flare build-up processes on the Sun planned for May and June 1980 as a part of the Solar Maximum Year are described.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 322-330
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  • 13
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    New methods for predicting the magnitude of sunspot maximum (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Three new and independent methods of predicting the magnitude of a forthcoming sunspot maximum are suggested. The longest lead time is given by the first method, which is based on a terrestrial parameter measured during the declining phase of the preceding cycle. The second method, with only a slightly shorter foreknowledge, is based on an interplanetary parameter derived around the commencement of the cycle in question (sunspot minimum). The third method, giving the shortest prediction lead-time, is based entirely on solar parameters measured during the initial progress of the cycle in question. Application of all three methods to forecast the magnitude of the next maximum (Cycle 21) agree in predicting that it is likely to be very similar to that of Cycle 18.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 264-279
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  • 14
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    Long-term solar activity predictions (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: The need for long term solar activity predictions is addressed. The spatial organization of solar activity is described including applications for predictions, and ancient evidence for solar variability. Methods of predicting sunspot numbers are discussed. The inherent accuracy of the methods varies considerably, but a typical error bar 20%. The accuracy of sunspot cycle predictions is considered along with long term predictions of great solar events.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 246-257
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  • 15
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    Very large geomagnetic disturbance during sunspot cycle 21: A prediction (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Evidence is presented which suggests that very large geomagnetic disturbances (350 gammas or greater at an invariant magnetic latitude of 50 degrees) occur once or twice per sunspot cycle, on the average. There is also some tendency for these disturbances to group in large odd numbered sunspot cycles similar to the current cycle, cycle 21. No such disturbance was noted during the past cycle although a series of major solar flares was observed in August 1972. At least one very large geomagnetic disturbance is expected during the current cycle; a prediction with perhaps serious consequences for electric power companies.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 193-197
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  • 16
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    PPS76: A computerized event mode solar proton forecasting technique (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: A procedure was developed to generate a computerized time intensity profile of the solar proton intensity expected at the Earth after the occurrence of a significant solar flares on the Sun. A combination of many pieces of independent research and theoretical results are included. A construction of selected experimental and theoretical results from the entire domain of solar terrestrial physics is given.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 406-427
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  • 17
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    Short-term solar activity forecasting (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: A method of forecasting the level of activity of every active region on the surface of the Sun within one to three days is proposed in order to estimate the possibility of the occurrence of ionospheric disturbances and proton events. The forecasting method is a probability process based on statistics. In many of the cases, the accuracy in predicting the short term solar activity was in the range of 70%, although there were many false alarms.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 176-181
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  • 18
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    Spiral sunspots and solar activity forecasts (1979)
    In:  CASI
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    Publikationsdatum: 2006-01-16
    Beschreibung: The definition of a spiral sunspot is given. Three examples are described which illustrate the processes of the occurrence of spiral sunspots and the roles played by them in prominence and flare activities. A method for solar activity forecasts is then proposed making use of parameters such as spiral sunspots, prominences and neutral lines.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 140-153
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  • 19
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    Long-term forecasting of solar activity (1979)
    In:  CASI
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    Publikationsdatum: 2006-01-16
    Beschreibung: Corrections to the forecast of the basic parameters of the 21st cycle are described. Estimates about the level of solar activity in the 22nd cycle are presented.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 163-175
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  • 20
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    Civil Helicopter icing problems (1979)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: The ice capabilities of rotary wing aircraft are examined. Recommendations are given to improve the inadequacies of the weather forecasts pertaining to ice, and to adopt a low maintenance anti-ice system.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 29-30
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  • 21
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    Overview of helicopter ice protection system developments (1979)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: Helicopter ice protection design criteria was developed and technological shortcoming in meeting helicopter mission requirements is that of helicopter rotor blade ice protection. Airframe components are protected using existing technology while the rotor blade protected using the cyclic electrothermal deicing concept.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 39-65
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  • 22
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    A review of the icing situation from the standpoint of general aviation (1979)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-12
    Beschreibung: An overview of the present situation in the field of aircraft icing with respect to certification and operation of nontransport category airplanes is given. Problems of definition and inconsistencies are pointed out. Problems in the forecasting and measurement of icing intensities are discussed. The present regulatory environment is examined with respect to its applicability and appropriateness to nontransport airplanes.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 31-38
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  • 23
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    Icing of aircraft Some remarks with an historical slant from a cloud physicist (1979)
    In:  CASI
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    Publikationsdatum: 2006-01-12
    Beschreibung: Three areas of interest are commented on: cloud physics, nowcasting, and instrumentation. A comparison is made of what was done 30 years ago to what might be done in light of developments in related areas of cloud physics, weather modification and instrumentation.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Lewis Res. Center Aircraft Icing; p 17-19
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  • 24
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    New atomic data of O/2+/ (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: New atomic data are tabulated for the ion O(2+). Collision strengths are calculated for several energies of the exciting electron. The populations of the levels of O(2+) are calculated as a function of electron density under conditions appropriate for the solar atmosphere. The available solar data are compared with theoretical predictions of relative line intensities.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 76; 3, Ju; July 197
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  • 25
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    Magnetic dips in the solar wind (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Using magnetic data from the Helios-1 fluxgate magnetometer, with a 0.2 s resolution, we have investigated the structure of several interplanetary discontinuities involving magnetic dips and rotations of the magnetic field vector. A minimum variance analysis illustrates the behaviour of the magnetic field through the transition. Using this analysis, quite different structures have been isolated and, in particular, narrow transitions resembling almost one dimensional reconnected neutral sheets. For the thinner cases (scale lengths of the magnetic rotation of the order or smaller than 1000 km), we find that the observed structures can be the nonlinear effect of a resistive tearing mode instability having developed on an originally one dimensional neutral sheet at the solar corona.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 62; May 1979
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  • 26
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    Solar wind heavy ions from flare-heated coronal plasma (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Information concerning the coronal expansion is carried by solar-wind heavy ions. Distinctly different energy-per-charge ion spectra are found in two classes of solar wind having the low kinetic temperatures necessary for E/q resolution of the ion species. Heavy-ion spectra which can be resolved are most frequently observed in the low-speed interstream (IS) plasma found between high speed streams; the streams are thought to originate from coronal holes. Although the sources of the IS plasma are uncertain, the heavy-ion spectra found there contain identifiable peaks of O, Si, and Fe ions. Such spectra indicate that the IS ionization state of O is established in coronal gas at a temperature of approximately 1.6 million K, while that of Fe is frozen in farther out at about 1.5 million K. On occasion anomalous spectra are found outside IS flows in solar wind with abnormally depressed local kinetic temperatures. The anomalous spectra contain Fe(16+) ions, not usually found in IS flows, and the derived coronal freezing-in temperatures are significantly higher. The coronal sources of some of these ionizationally hot flows are identified as solar flares.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 62; May 1979
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  • 27
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    Numerical solution for perpendicular sonic hydrogen injection into a ducted supersonic airstream (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: This note discusses a computer program being developed to study the flow field near opposing perpendicular fuel injectors in scramjets. The MacCormack time-split, finite difference relaxation technique was used to solve the full two-dimensional compressible Navier-Stokes equations along with energy and species equations. By using this technique, a program was developed to consider the turbulent nonreacting flow of hydrogen and air in a rectangular duct. A damping term, proportional to the second derivative of pressure and temperature, was used to produce a stable solution behind the hydrogen jet in the neighborhood of the recompression shock. A case using actual conditions encountered in current scramjet design was analyzed, with results agreeing qualitatively with experimental observations.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 17; May 1979
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  • 28
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    Hydromagnetic waves and turbulence in the solar wind (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The paper presents a state-of-the-art review of interplanetary fluctuations, their origins, and their effects on the solar wind. Typical values of parameters to waves and turbulence in the solar wind are examined, along with a classification of large-amplitude waves. Cases where description by the MHD theory is qualitatively correct and where it can be misleading are noted. An attempt is made to state rigorously the essential points of hydromagnetic-wave theory and to identify areas in which theoretical research needs to be extended. The review covers the observed hydromagnetic fluctuations, their interpretation in terms of current theory, and the degree of closure between observation and theory. The spatial distribution and origins of waves in the solar wind are discussed.
    Schlagwort(e): SOLAR PHYSICS
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  • 29
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    Generalized velocities in the outer region of hypersonic turbulent boundary layers (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: An attempt is made to show that the outer portion of the velocity profile of hypersonic turbulent boundary layers can be transformed so that the constants determined by a best fit to the law of the wake are in reasonable agreement with the wake constant for incompressible boundary layers at the same Reynolds number. Both y transformations (where y is distance from the surface) and velocity transformations produce velocity profiles which, with the proper choice of wall shear stress to give shear velocity, can be reduced to the incompressible law of the wall.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 17; Aug. 197
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  • 30
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    Coronal hole boundary brightness in lambda 284 of Fe XV (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 62; June 197
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  • 31
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    NASA's search for the solar connection. I (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: NASA's solar research, which leans toward the study of the sun as a star, is surveyed. The Orbiting Solar Observatory (OSO) program is covered, which yielded data such as spectras of 140-400 A wavelength of the entire solar disk. Attention is also given to the results obtained by Skylab, such as data showing that whenever a large coronal hole exists near the sun's equator, a stream of high-speed solar wind will be observed at the earth. Finally areas of future research, such as a concerted study of flare phenomenon, are discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Sky and Telescope; 58; Aug. 197
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  • 32
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    Accurate numerical evaluation of modified Struve functions occurring in unsteady aerodynamics (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A method is developed for computing the modified Struve functions that occur in unsteady aerodynamics. The method uses a rational approximation supplemented by an asymptotic series for large argument. Simple recursive formulas for generating the coefficients are derived. The method is capable of generating results of arbitrary accuracy. It can also be used for complex argument and order. For greater computing speed, a method is presented that uses the rational and asymptotic approximations to generate Chebyshev coefficients.
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Aircraft; 16; July 197
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  • 33
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    The source of electrostatic fluctuations in the solar-wind (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Solar wind electron and ion distribution functions measured simultaneously with or close to times of intense electrostatic fluctuations are subjected to a linear Vlasov stability analysis. Although all distributions tested were found to be stable, the analysis suggests that the ion beam instability is the most likely source of the fluctuations.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 84; May 1
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  • 34
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    A graphical summary of solar wind electron content observations by Pioneer 6, 8, and 9 (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Between 1965 and 1972, solar wind density measurements were obtained by Mariner 5 and Pioneer 6, 7, 8, and 9 using a radio science method called the 'dual-frequency experiment'. The measurements and data processing are now terminated. A graphical summary is presented of the best of the resulting data, showing the average electron number density of the solar wind across radio paths that vary in length up to 1.8 AU and that lie broadside to the flow direction. These graphs summarize 3.4 years of observations with a time resolution of 1 hour; the measurements provided 1-min resolution and spanned 7 years. Because the orientation and length of the paths change continually and have a major influence on the interpretation of these data, a spacecraft trajectory chart and a plot of the corotation interval are provided.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 84; Feb. 1
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    The N III and O IV intersystem multiplets as density indicators for solar plasmas (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The usefulness of the relative intensities of lines within the N III intersystem multiplet near 1750 A as an electron density indicator for solar plasmas is discussed. Although the relative intensities of lines in the multiplet are density sensitive, the intensity ratios should at present be used with caution. Errors of the order of 20% in transition probabilities and excitation rate coefficients can lead to order of magnitude errors in density determinations. It is demonstrated that the intensity ratio of one of the N III intersystem lines and an allowed line from a different ion may also be used as a density indicator in the 10 to the 9th to 10 to the 11th per cu cm regime.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 79; 3, No; Nov. 197
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    Long-term solar wind electron variations between 1971 and 1978 (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Imp solar wind electron data measured between 1971 and 1978 were studied with the aim of determining long-term variations near the earth. Two separate sets of parameter variations were observed: (1) in 1976-1977 the solar wind density, the electron temperature, and the interplanetary electrostatic potential were all enhanced, and (2) the halo density and associated electron parameters were all depressed during a 1 1/2-year period centered on the last 6 months of 1976. Although interpretation of these results in terms of corresponding coronal and interplanetary variations is not unique, it may be significant that measured solar wind parameters near the minimum of solar cycle 20 agree better with the Hartle-Sturrock model of the coronal expansion than they do during other epochs.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 84; Dec. 1
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    Laminar and turbulent flows over a spherically blunted cone with massive surface blowing (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Numerical solutions are presented for the flow over a spherically blunted cone with massive surface blowing. Time-dependent viscous shock layer equations are used to describe the flowfield. The boundary conditions on the body surface include a prescribed blowing rate distribution. The governing equations are solved by a time-asymptotic finite-difference method. Results presented here are only for a perfect gas-type flow at zero angle of attack. Both laminar and turbulent flow solutions are obtained. It is found that the surface blowing smooths out the effect of the curvature discontinuity at the sphere-cone juncture point on the laminar flowfield and results in a negative pressure gradient over the body. The shock slope increases on the downstream portion of the body as the surface blowing rate is increased. The turbulent flow with surface blowing is found to redevelop a boundary-layer-like region near the surface. The effects of this boundary-layer-like region on the flowfield and heating rates are discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 17; Dec. 197
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    The Fe XXI lambda1354 line in solar flares observed from Skylab and its implications on ionization equilibrium calculations (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 233
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  • 39
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    EUV limb spectra of a surge observed from Skylab (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The EUV spectra of a surge observed at plus 8 in. and plus 20 in. above the white light limb from Skylab are examined. The shape of the differential emission measure determined at 8 in. and 20 in. is nearly the same as for a quiet Sun spectrum at 8 in., but the emission measure of the surge at 8 in. is about an order of magnitude greater than for the quiet Sun. At 20 in. the emission measure of the surge is initially close to the quiet Sun distribution, but decreases by a factor of 4 within 6 min. The optically thin lines formed near 10 to the 5th power K show nonthermal broadening at 8 in., and electron densities near this temperature are derived from intersystem to resonance ratios. The volume of the emitting plasma at 8 in. above the limb was determined, concluding that a continuous energy input is required to explain the observations.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 78; 3, Oc; Oct. 197
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    New atomic data for Si/6+/, S/8+/ and Ar/10+/ (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The paper gives new atomic data, populations of excited levels, and line intensity ratios for the ions Si VII, S IX, and Ar XI of the O I isoelectronic sequence. Ten levels are included in the calculations, i.e., the levels of the 2s/2/2p/4/ and 2s2p/5/ and 2p/6/ configurations. It is noted that the calculations are done for applications to solar plasmas. The line ratios (2s/2/2p/4/3P1 - 2s2p/5/3P0) / (2s/2/2p/4/3P1 - 2s2p/5/3P1) and (2s/2/2p/4/1D2 - 2s2p/5/1P/1/) / (2s/2/2p/4/3P/1/ - 2s1p/5/3P/1/) are two of the ratios useful for electron density determination. Finally, density sensitive line ratios of Ca XIII and Fe XIX are also discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 80; 1, No; Nov. 197
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    Principal component analysis of solar flares in the soft X-ray flux (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The paper considers principal component analysis of solar flares in the soft X-ray flux, a technique for extracting the salient features from a mass of data. The method applies particularly to the analysis of nonstationary ensembles, and its computations require the evaluation of eigenvalues of matrices. The Eispack matrix eigen system routines were used to analyze full-disk proportional-counter data from the X-ray event analyzer which was part of the Skylab experiment. Empirical orthogonal functions were derived for events in the soft X-ray spectrum between 2.5 and 20 A during different time periods, indicating that about 90% of the cumulative power of each analyzed flare is contained in the largest eigenvector. The first two largest eigenvectors are sufficient for an empirical curve fit through the raw data and a characterization of solar flares in the soft X-ray flux, and power spectra of two largest eigenvectors reveal a reported periodicity of about 5 min.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 80; 2, De; Dec. 197
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  • 42
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    Nonlinear stability of solar type III radio bursts. II - Application to observations near 1 AU (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: A set of rate equations including strong turbulence effects and anomalous resistivity are solved using parameters which model several solar type III bursts. Analysis of these bursts has led to quantitative comparisons between several of the observed phenomena and the theory. Through use of an analytic model for the time evolution of the energetic electron exciter, it is found that the exciter distributions observed at 1 AU are unstable to the excitation of the linear bump-in-tail instability, amplifying Langmuir waves above the threshold for the oscillating two-stream instability (OTSI). The OTSI and the attendant anomalous resistivity produce a rapid spectral transfer of Langmuir waves to short wavelengths, out of resonance with the electron exciter. In addition, the various parameters needed to model the bursts are extrapolated inside 1 AU with similar results. Finally, reabsorption of the Langmuir waves by the beam is shown to be unimportant in all cases, even at 0.1 AU.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 234
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    Solar cycle variations in IMF intensity (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Annual averages of logarithms of hourly interplanetary magnetic field (IMF) intensities, obtained from geocentric spacecraft between November 1963 and December 1977, reveal the following solar cycle variation. For 2-3 years at each solar minimum period, the IMF intensity is depressed by 10-15% relative to its mean value realized during a broad 9-year period centered at solar maximum. No systematic variations occur during this 9-year period. The solar minimum decrease, although small in relation to variations in some other solar wind parameters, is both statistically and physically significant.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 84; Oct. 1
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    Solar variability and ozone (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Stratospheric temperature and concentration of ozone above 26 km, as measured by rocket-borne instruments, showed an increase from 1964 to 1969-70, and a decline between 1970 and 1975, closely following the solar cycle, which peaked in 1969 (+0.89 correlation at both 35 and 50 km). Similar correlations were found between the ozone density and the 10.7 cm solar radio flux (as measured by the Nimbus IV satellite), and between ozone column density and the Lyman-alpha flux, both observations being taken over the same 10 month period. A mechanism is hypothesized which would link solar flux variation with both changes in stratospheric temperature and concentration of ozone (which is produced by the photodissociation of stratospheric oxygen molecules by solar radiation in the ultraviolet wavelength region).
    Schlagwort(e): SOLAR PHYSICS
    Materialart: New Scientist; 84; Nov. 15
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    Nonlinear stability of solar type III radio bursts. I - Theory (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: A theory of the excitation of solar type III bursts is presented. Electrons initially unstable to the linear bump-in-tail instability are shown to rapidly amplify Langmuir waves to energy densities characteristic of strong turbulence. The three-dimensional equations which describe the strong coupling (wave-wave) interactions are derived. For parameters characteristic of the interplanetary medium the equations reduce to one-dimension. In that case the oscillating two-stream instability (OTSI) is the dominant nonlinear instability. OTSI is stabilized through the production of nonlinear ion density fluctuations that efficiently scatter Langmuir waves out of resonance with the electron beam. An analytical model of the electron distribution function is also developed which is used to estimate the total energy losses suffered by the electron beam as it propagates from the solar corona to 1 AU and beyond.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 234
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  • 46
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    The core electron temperature profile between 0.5 and 1.0 AU in the steady-state high speed solar wind (1979)
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 84; Aug. 1
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    NASA's search for the solar connection. II (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: A survey of future space missions planned to investigate the sun and how its events affect the earth is presented. The International Solar-Polar mission, scheduled for 1983, is designed to investigate the three-dimensional structure of the solar-wind flow and to study the corona from above the sun's poles. The Spacelab mission will make major contributions to solar study by employing a 1.25 m telescope for observations from the near violet to the near infrared wavelengths with an angular resolution of 0.1 arc sec, and will be capable of resolving features on the sun 72 km across. Other missions, including the International Sun-Earth Explorer and the solar cycle and dynamic mission, which is designed to study the global oscillations of the sun, are also discussed.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Sky and Telescope; 58; Sept
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    Variations of the sun's radius and temperature due to magnetic buoyancy (1979)
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Nature; 280; Aug. 23
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    Solar activity cycle during classical antiquity (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Early accounts of phenomena that may be identified as auroral displays have been abstracted from reports of unusual celestial prodigies in the classical literature. An extensive catalog of ancient aurorae and a new mathematical method of analyzing fragmentary time series of observations have been used to demonstrate, provisionally, that an auroral cycle actually existed in antiquity, at least during the 2nd century BC, and that it had an average length and amplitude comparable with those of the modern auroral cycle. On the reasonable supposition that solar activity has always been the factor responsible for aurorae, it can be concluded that the solar cycle two millennia ago was very similar to what it is today.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 77; 1-2,; Aug. 197
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    Solar radio spectrum extended to 10 km wavelength (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Solar radio spectra for quiet times and radio bursts in the wavelength range from 1 mm to 10 km are presented. Solar nonthermal emission in the range of 100 m to 10 km was monitored by means of long wire antennas connected to multi-channel radiometers in the frequency range 25 kHz to 10 MHz on board the IMP-6 and RAE-1 satellites. Flux densities for very intense type III bursts with intensities ranging from 10 to the -18th to 10 to the -14th W/sq m per Hz with maxima at 330 to 1500 m are shown, and a power-law wavelength distribution function of maximum burst intensities is derived. Intensities of a large type III noise storm are shown to increase with increasing wavelength to a peak near 500 m. The flux densities of both types of burst emission are observed to greatly exceed quiet sun intensities at long wavelengths.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Nature; 280; Aug. 16
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    On solar cosmic rays (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The report summarizes the major results obtained over the last four years in the following areas: (1) transport in interplanetary space which includes solar particle observations combined with theoretical efforts to develop models which simulate the dynamics of the event; (2) transport in the solar corona and release of particles in the interplanetary medium; and (3) characteristics of source spectra and acceleration models. Modelling the propagation of solar cosmic rays through interplanetary space and establishing the magnitude and the radial and energy dependence of the diffusion coefficient K are considered. An important result due to statistical observation is that the coronal propagation must be independent of or weakly dependent on both rigidity and energy. Increasing evidence is found for prolonged injection at the sun.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Reviews of Geophysics and Space Physics; 17; June 197
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    Dielectronic recombination rates, ionization equilibrium, and radiative energy-loss rates for neon, magnesium, and sulfur ions in low-density plasmas (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Results of detailed and systematic calculations are presented for the total dielectronic recombination rate coefficients for the ions of Ne, Mg, and S in a low-density predominantly hydrogen plasma. The new recombination rates are used to calculate solar corona ionization-equilibrium distributions of the ions. The most important effect of dielectronic recombination for ions in corona equilibrium is found to be a shift in the maximum-abundance temperatures toward higher temperatures, which are in some cases reduced from those predicted on the basis of the simple Burgess formula.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 230
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    Proton-driven electromagnetic instabilities in high-speed solar wind streams (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Electromagnetic instabilities of the field-aligned, right-hand circularly polarized magnetosonic wave and the left-hand circularly polarized Alfven wave driven by two drifted proton components are analyzed for model parameters determined from Imp 7 solar wind proton data measured during high-speed flow conditions. Growth rates calculated using bi-Lorentzian forms for the main and beam proton as well as core and halo electron velocity distributions do not differ significantly from those calculated using bi-Maxwellian forms. Using distribution parameters determined from 17 measured proton spectra, we show that considering the uncertainties the magnetosonic wave may be linearly stable and the Alfven wave is linearly unstable. Because proton velocity distribution function shapes are observed to persist for times long compared to the proton gyroperiod, the latter result suggests that linear stability theory fails for proton-driven ion cyclotron waves in the high-speed solar wind.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 84; Feb. 1
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    Fast, conservative schemes for the full potential equation applied to transonic flows (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Implicit approximate factorization techniques (AF) are investigated for the solution of matrix equations resulting from finite-difference approximations to the full potential equation in conservation form. For transonic flows, an artificial viscosity, required to maintain stability in supersonic regions, is introduced by an upwind bias of the density. Two implicit AF procedures are presented, and their convergence performance is compared with that of the standard transonic solution procedure: successive line overrelaxation (SLOR). Subcritical and supercritical test cases are considered. Results indicate a substantial improvement in convergence rate for AF schemes relative to SLOR.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 17; Feb. 197
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    Approximations for proton excitation - Erratum and extension (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Kastner (1977) proposed relatively simple approximations for proton excitation in coronal ions, which yield both excitation rate coefficients and excitation cross sections. An error in Kastner's expression for one of the partial excitation rate coefficients is corrected. The expression for excitation cross section is extended to higher energies, and the resulting expression for the other partial rate coefficient is given. Results obtained with the corrected and extended total excitation rate coefficient are presented for several representative transitions in Ca XIII, Ca XV, Fe X, Fe XIII, Fe XIV, Fe XVIII, and S X. The corrected and extended approximation is expected to yield excitation rates reliably within 50%.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 71; 1-2,; Jan. 197
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    Physics of the solar wind for the 1975-1978 IUUG Quadrennial Report (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The paper surveys topics related to the origin, expansion, and acceleration of the solar wind and the plasma physics of the interplanetary medium. The study of the relationship between coronal holes and solar-wind streams, and the associated revision of ideas about solar wind acceleration and heating are reviewed. In addition, topics of hydromagnetic waves and turbulence, and interplanetary electrons, as items of particular importance during the past quadrennium, are discussed. While the research discussed was concerned with data taken near solar minimum, further solar-wind studies will concentrate on observations from the rising and maximum phases of the solar cycle.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Reviews of Geophysics and Space Physics; 17; June 197
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    Criteria for asymptotic supersonic two-dimensional turbulent wakes (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Indicators used to determine the fully developed mean flow for two dimensional turbulent supersonic wakes are examined. The similarity variables for velocity temperature and the transverse coordinate used by Demetriades (1969) and Wagner (1972) are shown not to adequately distinguish transition from developed turbulent flows. The growth rate of the two dimensional turbulent wake as the wake develops from laminar to turbulent are shown to be low in the laminar region, increase at transition, and level off as fully developed turbulence is attained, demonstrating that wake growth rates are better indicators of a fully developed mean flow than are similarity variables.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 17; July 197
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  • 58
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    XUV electron density diagnostics for solar flares (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Potential electron-density diagnostics for the high-temperature component of solar flares are studied with reference to the wavelength region from 171 to 630 A. The specific ions discussed include Fe IX through Fe XV, Ni XI through Ni XVII, and ions in the beryllium, boron, carbon, and nitrogen isoelectronic sequences. Line ratios that could be useful as density indicators under solar-flare conditions are indicated, available data for the ions considered are reviewed, and several theoretical intensity ratios are plotted. The results are employed to determine the electron-density distribution as a function of electron temperature for several spectra from two flares. For these flares it is found that the electron density increases from 10 billion to 500 billion per cu cm for a temperature increase from 1 million to 10 million K.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal Supplement Series; 40; June 197
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    Magnetic fields, plasmas, and coronal holes - The inner solar system (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Recent results concerning streams and magnetic fields in the inner solar system are reviewed. Observations have shown that MHD streams are bounded by thin shear layers within 1 AU, probably because they originate in coronal holes which have sharp boundaries. The properties of Alfvenic fluctuations in streams cannot be fully explained on the basis of the hypothesis that they are plane, transverse Alfven waves. A more complete and accurate description might be that they represent nonplanar general Alfven waves weakly coupled to a compressive mode and moving through a medium containing tangential discontinuities and other convected inhomogeneities.
    Schlagwort(e): SOLAR PHYSICS
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  • 60
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    A theory of local and global processes which affect solar wind electrons. I - The origin of typical 1 AU velocity distribution functions - Steady state theory (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: A kinetic theory for the velocity distribution of solar wind electrons which illustrates the global and local properties of the solar wind expansion is proposed. By means of the Boltzmann equation with the Krook collision operator accounting for Coulomb collisions, it is found that Coulomb collisions determine the population and shape of the electron distribution function in both the thermal and suprathermal energy regimes. For suprathermal electrons, the cumulative effects of Coulomb interactions are shown to take place on the scale of the heliosphere itself, whereas the Coulomb interactions of thermal electrons occur on a local scale near the point of observation (1 AU). The bifurcation of the electron distribution between thermal and suprathermal electrons is localized to the deep solar corona (1 to 10 solar radii).
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Journal of Geophysical Research; 84; June 1
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    Quasi-periodic structure of a turbulent jet (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: The instantaneous near field pressure fluctuations of an axisymmetric subsonic jet were measured by using a longitudinal and an azimuthal microphone arrays in order to qualitatively determine the behaviors of the quasi-periodic structure within the flow. Statistical analysis is used to explain the characteristic of the pressure signals. In addition to the information obtained by forming the power spectral density, auto- and cross-correlation functions, two types of signals are extracted through a conditional probability analysis to represent the quasi-periodic and the random fine structures within the turbulent jet. The quasi-periodic structure first appears as a rolling up of the mixing layer flow within one nozzle diameter downstream of the exit, then becomes fully developed at approximately 3 nozzle diameters downstream with a preferred Strouhal number range 0.3-0.4, and finally disappears beyond the end of potential core. This behavior is also reflected in the variation of the convection velocity.
    Schlagwort(e): AERODYNAMICS
    Materialart: Journal of Sound and Vibration; 64; May 8
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    The high-temperature corona associated with a loop prominence system (1979)
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    Publikationsdatum: 2011-08-17
    Beschreibung: Flare-associated coronal loops were observed on the SE limb of the sun of 1972 February 9 by the Goddard X-ray and EUV spectroheliograph on board OSO 7. The loop structure is clearly visible in the lines of Mg VIII and Mg IX, whereas little or no detail is observed in Fe XV and Fe XVI. A looplike structure with a cloud of emission at the top is observed in soft X-rays. The temperature structure in the region has been calculated from the ratio Fe XVI/Fe XV. The isothermal contour plot is strikingly similar to the isointensity contour plots of the soft X-ray spectroheliograms. With these temperatures and the Fe XV intensity calculated from a calibration scheme developed by Chapman and Neupert, the emission measure has been estimated in the loops. Calculated energy losses suggest that continued deposition of energy is required over the observing period.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 229
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    Solar gamma rays above 8 MeV (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Processes that lead to the production of gamma rays with energy greater than 8 MeV in solar flares are reviewed and evaluated. Excited states that can be produced by inelastic scattering, charge exchange, and spallation reactions in the abundant nuclear species are considered in order to identify nuclear lines that may contribute to the gamma-ray spectrum of solar flares. The flux of 15.11-MeV gamma rays relative to the flux of 4.44-MeV gamma rays from the deexcitation of the corresponding states in C-12 is calculated for a number of assumed distributions of exciting particles. This flux ratio is shown to be a sensitive diagnostic of accelerated particle spectra. Other high-energy nuclear levels are not so isolated as the 15.11-MeV state and are not expected to be so strong. The spectrum of gamma rays from the decay of neutral pions is shown to be sensitive to the energy distribution of particles accelerated to energies greater than 100 MeV.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 229
    Format: text
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  • 64
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    Nonthermal broadening of extreme ultraviolet emission lines near the solar limb (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 73; 3, Ma; Mar. 197
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  • 65
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    On the nonthermal excitation and polarization of X-ray lines during solar flares (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The energy distributions of nonthermal electrons are derived from hard X-ray spectra taken during the impulsive phase of two 2B flares in February 1969. They are used to calculate the fluxes of nonthermally excited X-ray lines of hydrogen-like and helium-like ions. These fluxes are compared to the total line fluxes observed at the same time with crystal spectrometers. The nonthermal excitation is found to give only small contributions to the total line intensities. This implies that the impact polarization which is to be expected for anisotropic velocity distributions of the energetic electrons, will be low. Nevertheless it should be feasible to detect line polarization during the impulsive phase of strong X-ray flares.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 61; Feb. 197
    Format: text
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  • 66
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    The coronal atmosphere above solar active regions - Comparison of high spatial resolution soft X-ray and centimetric observations (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: High spatial resolution observations of solar active regions in soft X-rays and centimetric wavelengths are compared using X-ray and radio data obtained during the 1973 Skylab mission. An overall correspondence in position and size between regions of enhanced X-ray emission and regions of enhanced microwave emission was noticed. However, a closer analysis of the findings suggested that substantial differences exist between the emission properties of the atmosphere over sunspots and that over plages, with the difference probably related to the average intensity of the magnetic field, which was found to be higher over sunspot umbrae than over plage areas.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 229
    Format: text
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  • 67
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    On the structure of the solar transition zone and lower corona (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Recent observations of the solar transition zone and corona obtained primarily from NRL spectrographs on Skylab are summarized and used to examine the structure of the transition zone. The transition zone is revealed to be more inhomogeneous than is apparent from spectroheliograms with spatial resolution of about 3 arcsec. Transition-zone emission appears to arise in spicularlike structures. The effective area covered by the emitting structures at lower transition-zone temperatures (about 100,000 K) is only about 1% of the total surface area of the sun. The transition zone is highly inhomogeneous even over cell interior regions, where fluctuations in brightness by factors of 25 can occur. It is shown that homogeneous coronal models are not valid for the inner corona. Most of the higher-density inner corona is concentrated into looplike structures that extend down to the white-light limb. These structures are unrelated to the spicular-type structures that produce most of the transition-zone emission.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astrophysical Journal; vol. 229
    Format: text
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  • 68
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    Reynolds number effects on the turbulence field in compressible boundary layers (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Detailed experiments were conducted in a zero pressure gradient, supersonic turbulent boundary layer, including measurements of the three components of velocity fluctuations and the turbulent shear stress, for Reynolds numbers ranging from 11.7 million to 105 million at a freestream Mach number of 2.3. The mean flow measurements established the fully developed and equilibrium nature of the boundary layer. Measurements of the turbulence field show that the vertical and transverse fluctuations are essentially equal throughout the boundary layer at all Reynolds numbers, a feature that is different from observations in incompressible flows. The data show that the boundary layer exhibits similarity in the turbulence profiles for the entire Reynolds number range and agrees with previous compressible and incompressible data using Morkovin's scaling to account for compressibility effects.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA Journal; 17; Apr. 197
    Format: text
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  • 69
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    Fe XXI as an electron density diagnostic in solar flares (1979)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Atomic data have been calculated for Fe XXI, and the theoretical intensity ratios for many transitions are tabulated. Fe XXI lines in wavelength regions 1-25 A, 90-200 A, and 300-2500 A are discussed with reference to presently available solar and laboratory spectra. It is found that Fe XXI is an excellent density diagnostic for solar-flare and tokamak plasmas, when densities are in the range from 10 to the 11th to 10 to the 15th per cu cm. The theoretical calculations are applied to flare spectra obtained from OSO 5, and an electron density of less than 10 to the 13th per cu cm is deduced for a temperature of 10,000,000 K. The results are somewhat ambiguous in several cases because of the limited spectral and temporal resolution of these earlier spectrometers. However, the calculations will be important for forthcoming solar projects, such as the Solar Maximum Mission.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Astronomy and Astrophysics; 73; 1-2,; Mar. 197
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  • 70
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    Some steady and oscillating airfoil test results, including the effects of sweep, from the tunnel spanning wing (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A large scale tunnel spanning wing was built and tested. The model can be operated as either a swept or unswept wing and can be tested in steady state or oscillated sinusoidally in pitch about its quarter chord. Data is taken at mid-span with an internal 6-component balance and is also obtained from miniature pressure transducers distributed near the center span region. A description is given of the system and a brief discussion of some of the steady and unsteady results obtained to date. These are the steady load behavior to Mach numbers of approximately 1.1 and unsteady loads, including drag, at a reduced frequency of approximately 0.1.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 445-458
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    A new airfoil research capability (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The design and construction of a self streamlining wall test section for the Langley 0.3 meter transonic cryogenic tunnel was included in the fiscal year 1978 construction of facilities budget for Langley Research Center. The design is based on the research being carried out by M. J. Goodyer at the University of Southampton, Southampton, England, and is supported by Langley Research Center. This paper presents a brief description of the project. Included are some of the design considerations, anticipated operational envelope, and sketches showing the detail design concepts. Some details of the proposed operational mode, safety aspects, and preliminary schedule are presented.
    Schlagwort(e): AERODYNAMICS
    Materialart: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 425-432
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  • 72
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    Design and calibration of slotted walls for transonic airfoil wind tunnels (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The traditional procedure for estimating the performance of slotted walls for airfoil wind tunnels is reviewed, and a modification which improves the accuracy of this procedure is described. Unlike the traditional procedure, the modified procedure indicates that the design of airfoil wind-tunnel walls which induce minimal blockage and streamline-curvature effects is feasible. The design and testing of such a slotted wall is described. It is shown experimentally that the presence of a model can affect the plenum pressure and thus make the use of the plenum pressure as a calibration reference questionable. Finally, an ONERA experiment which shows the effect of the sidewall boundary layer on the measured model normal force is discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 433-443
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  • 73
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    Inverse boundary-layer technique for airfoil design (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: A description is presented of a technique for the optimization of airfoil pressure distributions using an interactive inverse boundary-layer program. This program allows the user to determine quickly a near-optimum subsonic pressure distribution which meets his requirements for lift, drag, and pitching moment at the desired flow conditions. The method employs an inverse turbulent boundary-layer scheme for definition of the turbulent recovery portion of the pressure distribution. Two levels of pressure-distribution architecture are used - a simple roof top for preliminary studies and a more complex four-region architecture for a more refined design. A technique is employed to avoid the specification of pressure distributions which result in unrealistic airfoils, that is, those with negative thickness. The program allows rapid evaluation of a designed pressure distribution off-design in Reynolds number, transition location, and angle of attack, and will compute an airfoil contour for the designed pressure distribution using linear theory.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 383-397
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  • 74
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    Langley's two-dimensional research facilities: Capabilities and plans (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The current capabilities and the forthcoming plans for Langley's two-dimensional research facilities are described. The characteristics of the Langley facilities are discussed in terms of Reynolds number, Mach number, and angle-of-attack capabilities. Comments are made with regard to the approaches which have been investigated to alleviate typical problem areas such as wall boundary effects. Because of the need for increased Reynolds number capability at high subsonic speeds, a considerable portion of the paper deals with a description of the 20 by 60 cm two-dimensional test section of the Langley 0.3 meter transonic cryogenic tunnel which is currently in the calibration and shakedown phase.
    Schlagwort(e): AERODYNAMICS
    Materialart: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 399-414
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  • 75
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    The prediction of two-dimensional airfoil stall progression (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A generalized boundary condition potential flow calculation method was combined with a momentum integral boundary layer method and a base flow theory of separation to predict airfoil viscous-inviscid interference up to and beyond stall. The resultant program considers laminar and turbulent separation and is, therefore, applicable to thin or thick airfoil stall. The calculated flow field includes the airfoil and the separation bubble recombination region behind the airfoil. Calculated pressure distributions and equivalent airfoil shapes, including the displacement thickness of the viscous regions, are compared with flow field measurements for several airfoils. The measured displacement thicknesses and wake centerlines corroborate the calculated shape. The comparison also suggests the use of the analytical solution to evaluate the measurements.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 335-345
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    Application of numerical optimization to the design of advanced supercritical airfoils (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: An application of numerical optimization to the design of advanced airfoils for transonic aircraft showed that low-drag sections can be developed for a given design Mach number without an accompanying drag increase at lower Mach numbers. This is achieved by imposing a constraint on the drag coefficient at an off-design Mach number while minimizing the drag coefficient at the design Mach number. This multiple design-point numerical optimization has been implemented with the use of airfoil shape functions which permit a wide range of attainable profiles during the optimization process. Analytical data for the starting airfoil shape, a single design-point optimized shape, and a double design-point optimized shape are presented. Experimental data obtained in the NASA Ames two-by two-foot wind tunnel are also presented and discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 315-325
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    Improved prediction of laminar leading edge separation (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Research was conducted to provide a definite criterion for the prediction of the bubble burst on airfoils typical of those used for fighter wings. The approach taken was to correlate existing airfoil bubble burst data using various parameters at the laminar separation point. The method due to Weber was modified to provide a continuous analytic solution for the velocity distribution around the airfoil leading edge. Coupling the modified Weber method with the Stratford laminar separation prediction method leads to a universal chart giving the conditions at separation as a function of stagnation location and leading edge radius. Application of the combined method to available two-dimensional airfoil data resulted in an empirical criterion presenting the limiting local velocity gradient at separation as a function of the boundary layer momentum thickness at separation for bubble burst. The correlation leads as well to the qualitative explanation of two types of laminar stall: thin airfoil and leading edge. The validity of the correlation is demonstrated by predicting the lift coefficient and angle of attack for stall on airfoils with leading edge or trailing edge flaps.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 327-334
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  • 78
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    Optimization of multi-element airfoils for maximum lift (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Two theoretical methods are presented for optimizing multi-element airfoils to obtain maximum lift. The analyses assume that the shapes of the various high lift elements are fixed. The objective of the design procedures is then to determine the optimum location and/or deflection of the leading and trailing edge devices. The first analysis determines the optimum horizontal and vertical location and the deflection of a leading edge slat. The structure of the flow field is calculated by iteratively coupling potential flow and boundary layer analysis. This design procedure does not require that flow separation effects be modeled. The second analysis determines the slat and flap deflection required to maximize the lift of a three element airfoil. This approach requires that the effects of flow separation from one or more of the airfoil elements be taken into account. The theoretical results are in good agreement with results of a wind tunnel test used to corroborate the predicted optimum slat and flap positions.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt.1; p 237-253
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    Improvements in surface singularity analysis and design methods (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The coupling of the combined source vortex distribution of Green's potential flow function with contemporary numerical techniques is shown to provide accurate, efficient, and stable solutions to subsonic inviscid analysis and design problems for multi-element airfoils. The analysis problem is solved by direct calculation of the surface singularity distribution required to satisfy the flow tangency boundary condition. The design or inverse problem is solved by an iteration process. In this process, the geometry and the associated pressure distribution are iterated until the pressure distribution most nearly corresponding to the prescribed design distribution is obtained. Typically, five iteration cycles are required for convergence. A description of the analysis and design method is presented, along with supporting examples.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 221-236
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    Prospects for computing airfoil aerodynamics with Reynolds averaged Navier-Stokes codes (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The Reynolds averaged Navier-Stokes equations are solved numerically for a variety of transonic airfoil configurations where viscous phenomena are important. Illustrative examples include flows past sensitive geometries, Reynolds number effects, and buffet phenomena.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 119-131
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    Overview of two-dimensional airfoil research at Ames Research Center (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The five basic elements of the two dimensional airfoil research program at Ames Research Center are illustrated. These elements are experimental, theoretical (including computational), validation, design optimization, and industry interaction. Each area is briefly discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 39-44
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    Low speed airfoil design and analysis (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: A low speed airfoil design and analysis program was developed which contains several unique features. In the design mode, the velocity distribution is not specified for one but many different angles of attack. Several iteration options are included which allow the trailing edge angle to be specified while other parameters are iterated. For airfoil analysis, a panel method is available which uses third-order panels having parabolic vorticity distributions. The flow condition is satisfied at the end points of the panels. Both sharp and blunt trailing edges can be analyzed. The integral boundary layer method with its laminar separation bubble analog, empirical transition criterion, and precise turbulent boundary layer equations compares very favorably with other methods, both integral and finite difference. Comparisons with experiment for several airfoils over a very wide Reynolds number range are discussed. Applications to high lift airfoil design are also demonstrated.
    Schlagwort(e): AERODYNAMICS
    Materialart: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 73-100
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    Langley airfoil-research program (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: An overview of past, present, and future airfoil research activities at the Langley Research Center is given. The immediate past and future occupy most of the discussion; however, past accomplishments and milestones going back to the early NACA years are dealt with in a broad-brush way to give a better perspective of current developments and programs. In addition to the historical perspective, a short description of the facilities which are now being used in the airfoil program is given. This is followed by a discussion of airfoil developments, advances in airfoil design and analysis tools (mostly those that have taken place over the past 5 or 6 years), and tunnel-wall-interference predictive methods and measurements. Future research requirements are treated.
    Schlagwort(e): AERODYNAMICS
    Materialart: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 11-38
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  • 84
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    Prediction of aerodynamic characteristics for slender bodies alone and with lifting surfaces to high angles of attack (1979)
    In:  CASI
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    Publikationsdatum: 2017-10-02
    Beschreibung: A method is presented for computing normal force and pitching moment coefficients for slender bodies of circular and noncircular cross section alone and with lifting surfaces. A semiempirical term representing viscous-separation crossflow is added to a term representing potential-theory crossflow. For bodies of revolution, computed aerodynamic characteristics agree with measured results for investigated free-stream Mach numbers from 0.6 to 2.9 and for angles of attack from 0 deg to 180 deg. For bodies of elliptic cross section, measured results are predicted well over the investigated Mach number range from 0.6 to 2.0 and the angle range from 0 deg to 60 deg. For all bodies the predictions are best at supersonic Mach numbers. For body-wing and body-wing-tail configurations, measured normal force coefficients and centers are predicted at the upper test Mach number of 2.0. As the Mach number is decreased to 0.6, the agreement for the normal-force coefficients rapidly deteriorates. When model flow-separation and vortex patterns are asymmetric, undesirable side forces are usually measured on the models at subsonic Mach numbers and zero sideslip angle. Generally, the side-force coefficients decrease or vanish with: increase in Mach number, decrease in nose fineness ratio, nose blunting, and flattening of body cross section.
    Schlagwort(e): AERODYNAMICS
    Materialart: AGARD High Angle of Attack Aerodyn.; 40 p
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    Recent theoretical developments and experimental studies pertinent to vortex flow aerodynamics, with a view towards design (1979)
    In:  CASI
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    Publikationsdatum: 2017-10-02
    Beschreibung: Recent progress in a research program directed toward an improved vortex flow technology base was reviewed. Analysis methods for conical flow and analysis and design methods for nonconical flows are presented. Applications are made for a variety of planar, nonplanar, and interferring lifting surfaces. Several methods are shown to provide reasonable estimates of over-all forces and moments for simple wing planforms with the suction analogy method currently offering the most versatility for arbitrary configuration applications. For the prediction of surface loadings the free vortex sheet method being developed by Boeing is shown to have considerable promise and further development of this type of method is encouraged. A data base for ogee strake-wing configurations is summarized with an emphasis on the requirements for maximizing the interference lift. A strake planform design procedure is discussed and a first solution (gothic in planview) is integrated with a wing body. The data show the strake to exhibit expected stable vortex characteristics. It was found that, apart from increasing sweep, conically cambered delta wings developed drag levels approaching that of attached flow with increasing either the lift or the wing camber height, lastly, an approximate vortex flow design method, based on the suction analogy, is outlined and an example is given.
    Schlagwort(e): AERODYNAMICS
    Materialart: AGARD High Angle of Attack Aerodyn.; 31 p
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    The Mechanism of Fluid Resistance (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: The mechanism of fluid resistance within the limit of the square law is presented. It was concluded that the investigations should be extended and completed in two directions, namely: by an investigation of stable vortex configurations in space, and by considering the perfect fluid as the limiting case of a viscous fluid and then limiting the law of vortex of formation with the condition that only those fluid particles which were in contact with the surface of the body can receive rotation.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Classical Aerodyn. Theory; p 57-66
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    Considerations of some critical ejector problems (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Some aspects of ejector design and application, including, three dimensional effects and cross flow effects are presented.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 363-384
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    Large-scale turbulent structures in jets and in flows over cavities and their relationship to entrainment and mixing (1979)
    In:  CASI
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    Publikationsdatum: 2016-06-07
    Beschreibung: Large scale structures in jets and in flows over cavities were investigated experimentally to determine their role in entrainment, mixing, and noise production. The presence of these structures resulted in growth of the shear layer and entrainment. Merging of adjacent large scale structures caused the near field pressure signal in excited flows. It is believed that both the entrained fluid as well as its eventual mixing with the jet flow can be controlled by introducing pulsation in the jet flow at a frequency for which the flow is most unstable.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 295-309
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  • 89
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    Recent developments in ejector technology in the Air Force: An overview (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Basic and applied studies in thrust augmentation conducted at the Aerospace Research Laboratory at Wright-Patterson AFB which led to an effective configuration of the jet flap diffuser ejector, are reviewed. A method for compressible ejector flow analysis, developed in support of the preliminary design of an ejector thrust aircraft, is discussed and applied to single- and two-stage ejectors.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 1-22
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  • 90
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    A Comparison of the Aerodynamic Characteristics of Eight Sailwing Airfoil Sections (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The operational characteristics of sailwings are discussed with emphasis placed on the importance of the trailing edge cable tension. The three dimensional aerodynamic characteristics were obtained from wind tunnel tests, and the results compared to determine the magnitude of the aerodynamic penalties paid for various structural simplifications. For the sectional thickness ratios, it is concluded that, while the basic double-membraned sailwing has exceptional aerodynamic performance, even superior for some applications to the conventional hardwing, any notable deviation from this configuration results in an unacceptably large performance penalty.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center The Sci. and Technol. of Low Speed and Motorless Flight, Pt. 1; p 155-176
    Format: application/pdf
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  • 91
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    Low-speed single-element airfoil synthesis (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The use of recently developed airfoil analysis/design computational tools to clarify, enrich and extend the existing experimental data base on low-speed, single element airfoils is demonstrated. A discussion of the problem of tailoring an airfoil for a specific application at its appropriate Reynolds number is presented. This problem is approached by use of inverse (or synthesis) techniques, wherein a desirable set of boundary layer characteristics, performance objectives, and constraints are specified, which then leads to derivation of a corresponding viscous flow pressure distribution. Examples are presented which demonstrate the synthesis approach, following presentation of some historical information and background data which motivate the basic synthesis process.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Langley Res. Center The Sci. and Technol. of Low Speed and Motorless Flight, Pt. 1; p 1-31
    Format: application/pdf
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  • 92
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    The external augmentor concept for V/STOL aircraft (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The beneficial aspects of an ejector powered V/STOL concept were reviewed. The feasibility of satisfactorily incorporating an ejector system in a high performance V/STOL aircraft was investigated. The external augmentor concept, based on the use of chordwise ejector slots, is presented. It is concluded that the external augmentor concept has a basic inherent simplicity and a sufficient augmentor performance potential to make feasible a high performance V/STOL aircraft based on ejectors.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 449-471
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  • 93
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    Interface concerns of ejector integration in V/STOL aircraft (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A number of areas which have in the past contributed to weight, complexity, and thrust losses in the ejector-powered V/STOL vehicle were identified. Most of these interfaces taken singly do not represent a severe compromise to the vehicle; however, the bottom line is that the sum of compromises and the subsequent effects on performance, flight operations and maintenance have rendered the ejector V/STOL aircraft unattractive. In addition to some of the unique ejector/aircraft integration problems, the vehicle by virtue of having a V/STOL capability, is compromised in other areas. To be successful and acceptable, the advantages must outweight the disadvantages and simplicity with minimum penalties must be the rule. It is concluded that more emphasis must be placed on the ejector/aircraft interface for the concept to be successful.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 397-415
    Format: application/pdf
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  • 94
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    Entrainment characteristics of unsteady subsonic jets (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The effectiveness of jet unsteadiness in enhancing flow entrainment was assessed. It was conducted that entrainment depends on the type and amount of jet unsteadiness. Apparently, the mere introduction of jet unsteadiness by small sinusoidal flow angle variations is insufficient to enhance entrainment but, it should be noted that the results were obtained at measuring stations which are all many nozzle widths downstream of the jet nozzle. Thus, no fully conclusive statement can be made at this time about the entrainment close to the nozzle. The high entrainment of the fluidically oscillated jet was caused by the high-frequency content of this square wave type of oscillation but more detailed measurements are clearly needed, in particular for the fluidically oscillated and the pulsed jets. Practical ejector application requires the proper trade-off between entrainment and primary nozzle thrust efficiency.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 311-324
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  • 95
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    Some tests on small-scale rectangular throat ejector (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A small scale rectangular throat ejector with plane slot nozzles and a fixed throat area was tested to determine the effects of diffuser sidewall length, diffuser area ratio, and sidewall nozzle position on thrust and mass augmentation. The thrust augmentation ratio varied from approximately 0.9 to 1.1. Although the ejector did not have good thrust augmentation performance, the effects of the parameters studied are believed to indicate probable trends in thrust augmenting ejectors.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 239-251
    Format: application/pdf
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  • 96
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    An Exploratory Investigation of the Effect of Plastic Coating on the Profile Drag of a Practical-Metal-Construction Sailplane Airfoil (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: An exploratory investigation was performed in the Langley low-turbulence pressure tunnel to determine the effect of a plastic coating on the profile drage of a practical-metal-construction sailplaine airfoil. The mode was tested with three surface configurations: (1) filled, painted, and sanded smooth; (2) rough bare metal; and (3) plastic-coated. The investigation was conducted at Reynolds numbers based on airfoil chord of 1,100,000, 2,200,000, and 3,300,000 at a constant Mach number of 0.10. The results indicate that, at all three Reynolds numbers, the order of the drag values of the three surface configurations, starting with the highest drag, was: filled, painted, and sanded smooth; rough bare metal; and plastic-coated.
    Schlagwort(e): AERODYNAMICS
    Materialart: The Sci. and Technol. of Low Speed and Motorless Flight, Pt. 1; p 33-64
    Format: application/pdf
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  • 97
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    A simple apparatus for the experimental study of non-steady flow thrust-augmenter ejector configurations (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A flexible, and easily modified, test rig is described which allows a one dimensional nonsteady flow stream to be generated, economically from a steady flow source of compressed air. This nonsteady flow is used as the primary stream in a nonsteady flow ejector constituting part of the test equipment. Standard piezo-electric pressure transducers etc. allow local pressures to be studied, as functions of time, in both the primary and secondary (mixed) flow portions of the apparatus. Provision is also made for measuring the primary and secondary mass flows and the thrust generated. Sample results obtained with the equipment are presented.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejector; p 325-349
    Format: application/pdf
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  • 98
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    Nonsteady-Flow Thrust Augmenting Ejectors (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Ejector augmenters in which the transfer of mechanical energy from the primary to the secondary flow takes place through the work of interface pressure forces are investigated. Nonsteady flow processes are analyzed from the standpoint of energy transfer efficiency and a comparison of a rotary jet augmenter to an ejector is presented.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 187-203
    Format: application/pdf
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  • 99
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    Numerical prediction of 3-D ejector flows (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The use of parametric flow analysis, rather than parametric scale testing, to support the design of an ejector system offers a number of potential advantages. The application of available 3-D flow analyses to the design ejectors can be subdivided into several key elements. These are numerics, turbulence modeling, data handling and display, and testing in support of analysis development. Experimental and predicted jet exhaust for the Boeing 727 aircraft are examined.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 55-70
    Format: application/pdf
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  • 100
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    The XFV-12A Thrust-Augmented Wing (TAW) prototype aircraft (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The XFV-12A, a unique V/STOL technology prototype aircraft being developed for the Navy, is described. The innovative design features a thrust augmented wing and a canard ejector. Structural, functional, and control test performances are discussed. Static tether test results are also discussed. Assessment of test results are given along with projections for future modification areas.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors; p 473-480
    Format: application/pdf
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