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  • LUNAR AND PLANETARY EXPLORATION  (3)
  • 1975-1979  (3)
  • 1976  (3)
  • 1
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    Drive tube 60009 - A chemical study of magnetic separates of size fractions from five strata (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Each bulk soil and both the magnetic and nonmagnetic components of the 90-150 micron and below 20 micron fractions of five soils from drive tube 60009 were analyzed. Samples were analyzed for FeO, Na2O, Sc, Cr, Co, Ni, Hf, Ta, Th, La, Ce, Sm, Eu, Tb, Yb, and Lu by neutron activation analysis. Several samples were fused and analyzed for major elements by electron microprobe analysis. Compositional variations are not systematically related to depth. The compositions of the five soils studied are well explained by a two-component mixing model whose end members are a submature Apollo 16-type soil and an extremely immature anorthositic material similar to 60025. There is evidence that the anorthositic component had received a small amount of exposure before these soils were mixed. After mixing, the soils received little exposure suggesting mixing and deposition on a rapid time scale.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A model of Jupiter's sulfur nebula (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A simple model of Jupiter's S II emission nebula is developed on the basis of a complete treatment of electron-impact excitation of sulfur ions. Forbidden line emission from S II ions excited by electron collisions in the Jovian nebula is analyzed, and existing observations are interpreted using a simple model of an S II nebula which is uniform in depth. The results show that the depth of the nebula is 300,000 to 600,000 km, the electron density is about 3160 per cu cm, the electron temperature is approximately 25,000 K, and the S II concentration is roughly 79 ions per cu cm. It is noted that these plasma conditions are quite different from those reported for the same region on the basis of Pioneer 10 data, indicating that the S II nebula is a sporadic event. Io is suggested as the source of the sulfur.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; 206; June 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Io, its atmosphere and optical emissions (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper outlines current understanding of phenomena associated with Io's atmosphere and optical emissions, along with a review of their relationships. The discussion covers the sodium D-line emission from Io, the ultraviolet emission observed from Pioneer 10, other optical emission lines, and future observational work on Io's line emission. Analysis of Io's ionosphere indicates that the atmosphere may be cooler than the observed sodium and that the exobase probably stands well above Io's surface. Also discussed is Io as a source of hydrogen and as a source of sodium. The observed electron profiles and the constraints provided by the emission cloud are consistent with two models of Io's neutral atmosphere. In the first model, hydrogen is supplied by dissociation of ammonia, whereas proton charge exchange is the primary source of hydrogen in the second model. Both models have the common feature that meteoritic impact or sputtering of the surface provides a source for sodium.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Colloquium on Jupiter: Studies of the interior, atmosphere, magnetosphere and satellites; May 19, 1975 - May 21, 1975; Tucson, AZ
    Format: text
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    NASA TECHNICAL REPORTS
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