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  • GEOPHYSICS  (2)
  • ENERGY PRODUCTION AND CONVERSION  (1)
  • Spacecraft Design, Testing and Performance
  • 1980-1984
  • 1975-1979  (3)
  • 1977  (3)
  • 1
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    Multiple satellite observations of pulsation resonance structure in the magnetosphere (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data from two intervals when pulsation activity was simultaneously observed on both ATS 1 and Ogo 5 satellites are presented. The first example, a Pc 4, indicates that this pulsation is caused by a field line near L = 7 resonating in its second-harmonic mode. This is inferred from both plasma density measurements and polarization characteristics. The wave was not observed at three ground stations in the vicinity of the satellite conjugate points. This indicates that Pc 4 waves are very localized in latitude and that a close array (less than 100 km) is needed to perform effective correlation with satellites. The second event, which is also in the Pc 4 band, can again be inferred to be a field line resonance from the polarization characteristics
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Feb. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The sun-tracking control of solar collectors using high-performance step motors (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sun-tracking solar energy-focusing devices involving a central receiver, thermionic conversion, or a distributed solar thermal collector system are described. The Perkins solar collector uses a fixed focal point about which an 18 m-diameter parabolic dish moves on tracks. The elevation axis also moves on a circular track. A microprocessor manipulates sun sensor information and sun ephemeris data to ensure correct placement. Stepper motors are digital devices which provide direct interface with digital electronics and a wide dynamic range, and could easily be associated with the microprocessors. Design philosophy, performance criteria, wind load analysis, and control system requirements are also discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Annual Symposium on Incremental Motion Control Systems and Devices; May 24, 1977 - May 27, 1977; Urbana, IL
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A statistical study of Pc 3 magnetic pulsations at synchronous orbit, ATS 6 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are reported for a study designed to determine statistically the nature and variation of the polarization parameters of Pc3 magnetic pulsations at synchronous orbit. Data obtained with a triaxial flux gate magnetometer on the geosynchronous satellite ATS 6 are subjected to routine power spectral and polarization analyses, and the events examined are identified as peaks in the spectra. Coherence analysis of spectral matrices for these events indicates that Pc3 are very common at synchronous orbit and are primarily a local morning phenomenon with an occurrence peak around 1000 LT; that the pulsations occur at all frequencies in the Pc3 band, with the most common frequency at about 0.35 Hz; that the Pc3 at synchronous orbit are most often linear and generally transverse, but some have significant compressional components; and that based on azimuth angle, there are two distinct classes of Pc3 (azimuthal and radial) with different characteristics. These statistical results are compared with model predictions and ground-based observations.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Mar. 1
    Format: text
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    NASA TECHNICAL REPORTS
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