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  • ASTROPHYSICS  (3)
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  • 1
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    Polar solar wind and interstellar wind properties from interplanetary Lyman-alpha radiation measurements (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The analysis of Mariner 10 observations of Lyman-alpha resonance radiation shows an increase of interplanetary neutral hydrogen densities above the solar poles. This increase is caused by a latitudinal variation of the solar wind velocity and/or flux. Using both the Mariner 10 results and other solar wind observations, the values of the solar wind flux and velocity with latitude are determined for several cases of interest. The latitudinal variation of interplanetary hydrogen gas, arising from the solar wind latitudinal variation, is shown to be most pronounced in the inner solar system. From this result it is shown that spacecraft Lyman-alpha observations are more sensitive to the latitudinal anisotropy for a spacecraft location in the inner solar system near the downwind axis.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics; 95; 1, Fe; Feb. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Simultaneous H/1216 A/ and He/584 A/ observations of the interstellar wind by Mariner 10 (1979)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: In late 1973 and early 1974 the Mariner 10 spacecraft performed four roll calibration maneuvers (RCM). The Ultraviolet Spectrometer (UVS) measured the intensity of both He(584 A) and H(1216 A) emissions from interplanetary gas. The data and the observational geometry have been described by Broadfoot and Kumar (1978). Analysis of these 4 sets of observations is extremely important since they are the first simultaneous intensity measurements of H and He emissions free of geocoronal contamination to be recorded in one day, thus precluding significant variations in the solar fluxes.
    Keywords: ASTROPHYSICS
    Type: In: Space research XIX; May 29, 1978 - Jun 10, 1978; Innsbruck; Austria
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    NASA TECHNICAL REPORTS
  • 3
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    Four UV observations of the interstellar wind by Mariner 10 - Analysis with spherically symmetric solar radiation models (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Four Mariner 10 observations of interplanetary hydrogen 1216-A and helium 584-A emissions are analyzed by using radiation models that employ spherically symmetric solar radiation fields. It is shown that the measured 584-A intensities can be represented with a statistical accuracy of about 10% by a model that assumes spherical symmetry for the 584-A solar radiation and that the 1216-A intensities can be represented to within 15% by a model based on spherically symmetric solar corpuscular and EUV radiation. An interstellar wind velocity of 22 km/s, a helium number density of 0.008 per cu cm, and an interstellar neutral-gas temperature of 1500 K near the solar system are obtained from Copernicus satellite measurements.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics; 73; 3, Ma; Mar. 197
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    NASA TECHNICAL REPORTS
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