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  • Other Sources  (23)
  • 1975-1979  (23)
  • 1
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    The analysis of high spatial resolution UV and X-ray images by computational modeling (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: Very high resolution stereoscopic images of high temperature loop structures observed at UV and X-ray wavelengths in the solar corona can be used to understand physical processes in the corona. An existing computational model is described and sample results are given to demonstrate that computational modeling of coronal structures can indeed take advantage of very high resolution images. The sample results include the run of temperature and number density along a typical loop and the variation of the differential emission measure with temperature. The integration of the differential emission measure with temperature along a column commensurate with an instrument's spatial resolution is the relevant parameter obtained from UV and X-ray observations. The effects of loop geometry and energy input are examined.
    Keywords: SOLAR PHYSICS
    Type: JPL A Close-up of the Sun; p 118-131
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    General flat four-dimensional world pictures and clock systems (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: We explore the mathematical structure and the physical implications of a general four-dimensional symmetry framework which is consistent with the Poincare-Einstein principle of relativity for physical laws and with experiments. In particular, we discuss a four-dimensional framework in which all observers in different frames use one and the same grid of clocks. The general framework includes special relativity and a recently proposed new four-dimensional symmetry with a nonuniversal light speed as two special simple cases. The connection between the properties of light propagation and the convention concerning clock systems is also discussed, and is seen to be nonunique within the four-dimensional framework.
    Keywords: PHYSICS (GENERAL)
    Type: Foundations of Physics; 8; 11-12; 1978
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Software development guidelines (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Analysis, modularization, flowcharting, existing programs and subroutines, compatibility, input and output data, adaptability to checkout, and general-purpose subroutines are summarized. Statement ordering and numbering, specification statements, variable names, arrays, arithemtical expressions and statements, control statements, input/output, and subroutines are outlined. Intermediate results, desk checking, checkout data, dumps, storage maps, diagnostics, and program timing are reviewed.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-171748 , JSC-14710 , NAS 1.26:171748 , LEC-13182
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Numerical modeling of quasi-static coronal loops. I - Uniform energy input (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A quasi-static numerical model for coronal loops is considered for the case of a uniform energy input per unit volume into the loops. A line dipole model is used to represent the loop magnetic field, and the variations in loop cross section observed in X-ray photographs are parameterized by the ratio between the cross-sectional areas at the loop apex and base. The results of numerical modeling indicate that for an area ratio greater than unity, increases in the area ratio of a loop with a given length and apex area cause a general rise in electron density and a fall in the temperature gradient, leading to large increases in the differential emission factor at high temperatures. The differential function obtained is significantly different from that predicted by analytical models; however, analytical predictions for the temperature-electron density relations are comparable to numerical results. It is also concluded that even a symmetrical loop may have a maximum temperature away from the apex.
    Keywords: SOLAR PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Subsonic stability and control characteristics of a 0.015-scale (remotely controlled elevon) model 44-0 of the space shuttle orbiter tested in the NASA/ARC 12-foot pressure tunnel (LA66) (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The investigation was conducted in the NASA/Ames Research Center 12-foot Pressure Tunnel. The model was a Langley-built 0.015-scale SSV orbiter model with remote independently operated left and right elevon surfaces. The objective of the test was to generate a detailed aerodynamic data base for the current shuttle orbiter configuration. Special attention was directed to definition of nonlinear aerodynamic characteristics by taking data at small increments in angle of attack, angle of sideslip, and elevon position. Six-component aerodynamic force and moment and elevon position data were recorded over an angle of attack range from -4 deg to 24 deg at angles of sideslip of 0 deg and + or - 4 deg. Additional tests were made over an angle of sideslip range from -6 deg to 6 deg at selected angles of attack. The test Mach numbers were 0.22 and 0.29 and the Reynolds number was varied from 2.0 to 8.5 million per foot.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-147621 , DMS-DR-2281
    Format: application/pdf
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  • 6
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    Observations of the structure and evolution of solar flares with a soft X-ray telescope (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Soft X ray flare events were observed with the S-056 X-ray telescope that was part of the ATM complement of instruments aboard SKYLAB. Analyses of these data are reported. The observations are summarized and a detailed discussion of the X-ray flare structures is presented. The data indicated that soft X-ray emitted by a flare come primarily from an intense well-defined core surrounded by a region of fainter, more diffuse emission. An analysis of flare evolution indicates evidence for preliminary heating and energy release prior to the main phase of the flare. Core features are found to be remarkably stable and retain their shape throughout a flare. Most changes in the overall configuration seem to be result of the appearance, disappearance or change in brightness of individual features, rather than the restructuring or reorientation of these features. Brief comparisons with several theories are presented.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-144097 , ATR-75(7405)-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A survey of coronal holes and their solar wind associations throughout sunspot cycle 20 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Space-borne X-ray and XUV observations during the period 1963-74 (corresponding approximately with solar cycle 20) have been used to investigate the relationship between the occurrence and variability of coronal holes and solar activity, i.e., the solar wind. Results indicate that polar holes (prominent at solar minimum) decreased in area as solar activity increased. The equatorial holes were also small during this period and persisted for one or two solar rotations only. Solar wind streams in excess of 500 km/s were associated with coronal holes at less than 40 deg latitude, although solar coronal holes appear to have no associated wind streams at earth.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 56; Jan. 197
    Format: text
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  • 8
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    Observations of the structure and evolution of solar flares with a soft X-ray telescope (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: One hundred thirty-two soft X-ray flare events have been observed with the S-056 X-ray telescope aboard Skylab. The observations are summarized, and a detailed discussion of the X-ray flare structures is presented. The data indicated that soft X-rays emitted by a flare come primarily from an intense well-defined core surrounded by a region of fainter more diffuse emission. Loop structures are found to constitute a fundamental characteristic of flare cores, and arcades of loops are found to play a more important role in flare phenomena than previously thought. Size distributions of these core features are presented, and a classification scheme describing the brightest flare X-ray features is proposed. Analysis of flare evolution indicates evidence for preliminary heating and energy release prior to the main phase of the flare. Core features are found to be remarkably stable and to retain their shape throughout a flare. Most changes in the overall configuration seem to be the result of the appearance, disappearance, or change in brightness of individual features, rather than the restructuring or reorientation of these features.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 45; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Astronomical applications of grazing incidence telescopes with polynomial surfaces (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The report has examined the claim that grazing incidence telescopes having surfaces described by generalized equations have image characteristics superior to those of the paraboloid-hyperboloid and Wolter-Schwarzschild configurations. With emphasis on specific applications in solar and cosmic X-ray/EUV astronomy, raytracing has shown that in many cases there is no advantage in the polynomial design, and in those cases where advantages are theoretically to be expected, the advantages are outweighed by practical considerations.
    Keywords: ASTRONOMY
    Type: Space optics: Imaging X-ray optics workshop; May 22, 1979 - May 24, 1979; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Layered synthetic microstructures - Properties and applications in X-ray astronomy (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Refinements in vacuum deposition technology have made it possible to produce structures in which two materials are arranged in alternating layers of uniform thickness and as thin as 5 A. Such structures act as Bragg diffractors or 'artificial crystals' for X-rays, as well as they may be regarded as multilayer interference coatings. A dynamical theory is used to show how the properties of layered synthetic microstructures are dependent on the layer materials and thicknesses and how these properties can be tailored to specific applications. Laboratory results at various X-ray wavelengths are presented. In particular, specific X-ray astronomy applications in spectroscopy, imaging, polarimetry and laboratory calibration are discussed.
    Keywords: ASTRONOMY
    Type: Space optics: Imaging X-ray optics workshop; May 22, 1979 - May 24, 1979; Huntsville, AL
    Format: text
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