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  • LUNAR AND PLANETARY EXPLORATION  (2)
  • ELECTRONIC COMPONENTS AND CIRCUITS
  • 1990-1994  (3)
  • 1965-1969
  • 1991  (3)
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  • 1990-1994  (3)
  • 1965-1969
Year
  • 1
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    Meridional Martian water abundance profiles during the 1988-1989 season (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Martian southern hemisphere atmospheric water vapor column abundance measurements reported agree with Viking Orbiter atmospheric water detectors during early southern spring and southern autumnal equinox; profiles obtained in southern mid- and late summer, however, indicate the presence of twice as much water both in the southern hemisphere and planetwide. This discrepancy is accounted for by the high optical depths created by two global dust storms during the Viking year, while the present observations were obtained in the case of the relatively dust-free atmosphere of the 1988-1989 opposition.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 90; 205-213
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The structure of Io's corona (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A spatial profile of the distribution of sodium in Io's corona has been constructed using measurements obtained during satellite mutual eclipses. The data reveal a fairly symmetric corona whose density falls steeply from the surface out to 6 r(Io) and more slowly outside. An upper limit of 700 km is placed on the exobase altitude, but the observations do not constrain the surface density. Several theoretical models adequately match some traits of the corona, but none satisfies all the observations. No strong upstream/downstream asymmetry of the corona is observed, so it is unlikely that the corona is primarily generated by the impact of corotating ions into the trailing hemisphere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 368; 298-315
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Resistor Extends Life Of Battery In Clocked CMOS Circuit (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Addition of fixed resistor between battery and clocked complementary metal oxide/semiconductor (CMOS) circuit reduces current drawn from battery. Basic idea to minimize current drawn from battery by operating CMOS circuit at lowest possible current consistent with use of simple, fixed off-the-shelf components. Prolongs lives of batteries in such low-power CMOS circuits as watches and calculators.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-17967 , NASA Tech Briefs (ISSN 0145-319X); 15; 9; P. 29
    Format: text
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    NASA TECHNICAL REPORTS
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