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  • ASTROPHYSICS  (2)
  • SPACECRAFT INSTRUMENTATION  (1)
  • 1975-1979  (3)
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  • 1
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    Motion of shocks through interplanetary streams (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A model for the motion of flare-generated shocks through interplanetary streams is presented which illustrates the effects of a stream-shock interaction on the shock strength and geometry. It is a gasdynamic calculation based on Whitham's (1958) method and on an empirical approximation for the relevant characteristics of streams. The results show that the Mach number of a shock can decrease appreciably to near unity in the interaction region ahead of streams and that the interaction of a spherically symmetric shock with a spiral-shaped corotating stream can cause significant distortions of the initial shock-front geometry. The geometry of a shock discussed by Lepping and Chao (1972) is qualitatively explained by this model.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research; 80; Oct. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The electron spectrometer experiment on ISEE-1 (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A six-axis electron spectrometer for the ISEE-1 spacecraft is described and some typical early results presented. This instrument, designed for three-dimensional plasma distribution function studies in the solar wind, magnetosheath, outer magnetosphere, and near tail regions, has three energy ranges: 7.5-512 eV, 11-2062 eV, and 109-7285 cV, respectively. Two channel electron multipliers are used at the output of each of six cylindrical electrostatic analyzers. The total mass of two sensors and a data processing unit is 4.9 kg and the power comsumption is 3.5 W. Two hundred information bits/s telemetry rate is required.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience Electronics; GE-16; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Observations at the planet Mercury by the plasma electron experiment, Mariner 10 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Plasma electron observations made onboard Mariner 10 are reported. Three encounters with the planet Mercury show that the planet interacts with the solar wind to form a bow shock and a permanent magnetosphere. The observations provide a determination of the dimensions and properties of the magnetosphere, independently of and in general agreement with magnetometer observations. The magnetosphere of Mercury appears to be similar in shape to that of the Earth but much smaller in relation to the size of the planet. Electron populations similar to those found in the Earth's magnetotail, within the plasma sheet and adjacent regions, were observed at Mercury; both their spatial location and the electron energy spectra within them bear qualitative and quantitative resemblance to corresponding observations at the Earth. The magnetosphere of Mercury resembles to a marked degree a reduced version of that of the Earth, with no significant differences of structure.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-X-71210 , X-692-76-223
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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