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  • INORGANIC AND PHYSICAL CHEMISTRY  (1)
  • LUNAR AND PLANETARY EXPLORATION  (1)
  • 1980-1984  (2)
  • 1
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    Properties of the Io plasma torus inferred from Voyager EUV data (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A physical model for the Io plasma torus is constructed to explain the EUV radiative emission observed by the Voyager UV spectrometer. Electron impact excitation rate coefficients for electronic transitions of S III, S IV, O II and O III are calculated by the method of distorted waves (Davis, Kepple, and Blaha, 1976); these coefficients account for the asymmetric shape of the 686 A feature. It is concluded that the electron gas must have a distribution function with a non-Maxwellian tail. An approximate representation of the distribution function as two temperature components requires a cold component of 3.5-4 eV and density of 2000 per cu cm and a hot component of about 100 eV and density of 50-100 per cu cm to satisfy observational constraints.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 238
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    X-ray diffraction analysis of Nb-3Ge and NbGe alloys (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Of all the A-15 samples of NbGe alloy examined, DT 094 is unique in that it was at least 99% pure A-15 phase. Also its diffraction peaks were noisy as if there were about a one percent compositional variation on this phase. DT 094, however, was only a large fragment of the drop tube drop, and thus its small sample size may have reduced the intensity, thus enhancing fluctuations enough to explain some of the loss of peak resolution.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-170831 , NAS 1.26:170831
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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