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  • AERODYNAMICS  (381)
  • SOLAR PHYSICS  (256)
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1985-1989
  • 1975-1979  (872)
  • 1978  (872)
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  • 1985-1989
  • 1975-1979  (872)
Year
  • 1
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    Z-rich solar particle event characteristics 1972-1976 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is found in the reported investigation that Z-rich solar particle events usually have large and prolonged anisotropies in addition to an extremely variable charge composition that varies not only from event to event but also throughout the event. These observations suggest that one can no longer regard the event-averaged composition of solar particle events at low energies as providing an unbiased global sample of the solar atmospheric composition. The variability from event to event and among classes of events is just too great. However, the tendency for the Z-rich events to be associated with both the low-speed solar wind at or just before the onset of solar wind streams and with active regions located in the western hemisphere, indicates that charge composition studies of solar particle events can yield a better knowledge of the flare acceleration process as well as the inhomogeneous nature of magnetic field structure and particle composition in the solar atmosphere.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 225
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Theoretical response of condenser microphones (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Modifications to prior theory yield expressions for the frequency response and equivalent lumped elements of a condenser microphone in terms of its fundamental geometrical and material properties. Results of the analysis show excellent agreement with experimental data taken on B&K pressure microphone types 4134 and 4146.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Acoustical Society of America; vol. 64
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Optical observations of the sun from a solar probe (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The spatial resolution of solar surface structure to ultimate limits with simple instrumentation. The logic is simple: a 10 cm aperture telescope at 4 solar radii resolves the equivalent of a five meter telescope in earth orbit. Given the ease of producing a diffraction limited 10 cm telescope and the difficulty of fabricating a diffraction limited 5 meter telescope, the performance of the small telescope could well be better. The telescope described complements planned solar orbiting telescopes in earth orbit and would need only a few arcs seconds of pointing.
    Keywords: SOLAR PHYSICS
    Type: JPL A Close-up of the Sun; p 89-91
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Studies of solar flares using optical, X-ray and radio data (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: X-ray, radio, H-alpha, and 3835-A data for a number of solar flares identified as sources of X-ray bursts are compared and analyzed. Eight of the more distinctive flares are described in detail, the exact value of H-alpha intensity is determined, and the production of the H-alpha emission is considered. It is shown that: (1) there is a good correspondence between the rise and peak of H-alpha emission and hard X-ray flux; (2) the H-alpha surface brightness of hard and soft X-ray bursts is the same for flares of the same soft X-ray flux; (3) all multiple spikes correspond to different steps in optical flares development; (4) smaller flares produce no observed brightening; (5) there is evidence that the low chromospheric network is not heated by conduction from above; and (6) the flare H-alpha emission can be explained by direct excitation of a preflare cloud or prominence by the flare electrons and their secondaries.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 58; June 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Wake flow measurements with a mobile laser Doppler velocimeter system (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Wake flow measurements were conducted with a mobile laser Doppler velocimeter (LDV). The measurements included surveys of aircraft wake vortices behind a B-747 aircraft, aircraft carrier wake measurements from aboard the U.S.S. Nimitz, and tower wake measurements for a 100 kW wind turbine. Results of these tests demonstrated that a mobile ground-based LDV is a versatile and useful tool for the measurement of full-scale three-dimensional wake flows. The potential is demonstrated for utilization of this system to study complex wakes for a variety of applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 78-823 , Aerodynamic Testing Conference; Apr 19, 1978 - Apr 21, 1978; San Diego, CA
    Format: text
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  • 6
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    Simultaneous velocity and particle size measurement in two phase flows by Laser Anemometry (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A technique for particle size measurement by using Laser Doppler Anemometry is discussed. An additional gate photomultiplier has been introduced at right angles to the optical axis in order to select only those particles passing through the central region of the measurement control volume. Particle sizing measurements have been made in sprays of glass particles using the modified Laser Anemometry system. Measurements in fuel sprays are also reported and compared with the results obtained by a photographic technique. The application of the particle sizing technique to opaque particles is investigated and suitable optical arrangements are suggested. Light scattering characteristics of Laser Anemometry systems for different optical geometries are calculated to select the optimum optical arrangement for the particle sizing measurements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 78-74 , Aerospace Sciences Meeting; Jan 16, 1978 - Jan 18, 1978; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Versatile LDV burst simulator (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A device for generating burst signals is reported that can be used to determine whether or not a laser Doppler velocimeter is operating properly. A high frequency signal which corresponds to the information frequency of the laser Doppler velocimeter is modulated by a low frequency signal to provide an envelope for the high frequency signal. The high frequency signal is modulated by any modulator means such as, for example, an analog multiplier. The low frequency signal is added to the modulated signal to provide pedestals for the resulting series of burst pulses. The means are provided for selecting different combinations of these burst signals. Also means are provided for making the burst signals asymmetrical as desired. In addition, means are provided for varying the frequencies, and amplitudes of the information, envelope and pedestal frequency signals in the burst signals.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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  • 8
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    Zodiacal light dynamics experiment: A wideband imaging Fabry-Perot interferometer (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The Solar Probe will provide an ideal platform from which to study dynamics of dust particles near the sun by measuring the detailed character of the Fraunhofer structure of the zodiacal light. The suggested instrument is a wideband imaging Fabry-Perot interferometer with state of the art technology in both the optics and the detector. The instrument would function as a high-resolution imaging device providing wavelength resolution of 0.03 A over about a 20 A range. The wideband imaging capability would provide sky maps of the zodiacal light on a despun spacecraft without mechanical scanning. The Solar Probe mission would allow the velocity distribution of the dust to be mapped along most of the trajectory of the spacecraft.
    Keywords: SOLAR PHYSICS
    Type: JPL A Close-up of the Sun; p 420-429
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Effects of spanwise nozzle geometry and location on the longitudinal aerodynamic characteristics of a vectored-engine-over-wing configuration at subsonic speeds (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A V/STOL tunnel study was performed to determine the effects of spanwise blowing on longitudinal aerodynamic characteristics of a model using a vectored-over-wing powered lift concept. The effects of spanwise nozzle throat area, internal and external nozzle geometry, and vertical and axial location were investigated. These effects were studied at a Mach number of 0.186 over an angle-of-attack range from 14 deg to 40 deg. A high pressure air system was used to provide jet-exhaust simulation. Engine nozzle pressure ratio was varied from 1.0 (jet off) to approximately 3.75.
    Keywords: AERODYNAMICS
    Type: NASA-TP-1215 , L-12015
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Some contemplated improvements to the prototype Lixiscope (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Some contemplated improvements on the Lixiscope are described. These can be divided roughly into two categories: those which are well within existing technology, and thus can be implemented immediately; and those which are more at the state-of-the-art level, and which are directly related to applications in X-ray and gamma ray imaging in astronomy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Preliminary Appl. and Evaluation Results. Lixiscope; p 15-18
    Format: application/pdf
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