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  • 1990-1994
  • 1985-1989  (5)
  • 1985  (5)
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  • 1990-1994
  • 1985-1989  (5)
Year
  • 1
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    On the structure and dynamics of the thermosphere (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Thermospheric temperature, composition and wind measurements from the Dynamics Explorer satellite (DE-2) are interpreted using a three dimensional, multiconstituent spectral model. The analysis accounts for tides driven by the absorbed solar radiation as well as energy and momentum coupling involving the magnetosphere and lower atmosphere. Phenomena associated with the annual tide, polar circulation, magnetic storms and substorms are discussed.
    Keywords: GEOPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 5; 4, 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    On the diurnal variations in the temperature and composition - A three-dimensional model with superrotation (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An improved (Mayr et al., 1980) three-dimensional multiconstituent spectral model of the Venus thermosphere dynamics is presented, which describes the diurnal variations in the atmospheric composition (in terms of O, CO, and CO2 densities obtained by ONMS and OIMS, temperature, and wind fields on the basis of simplified theoretical interpretations of data obtained by the Pioneer Venus mission. The improved model accounts for nonlinear processes, includes higher order tidal elements, and describes the major gases in self-consistent form. Also presented is a self-consistent, nonlinear solution from a two-dimensional quasi-axisymmetric spectral model which describes the four-day superrotation in the lower atmosphere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 5; 9, 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Conjecture on superrotation in planetary atmospheres - A diffusion model with mixing length theory (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The component of rigid shell superrotation on Venus is discussed in the context of comparative planetary atmospheres. A simplified, heuristic analysis, utilizing mixed length theory to describe the small scale nonlinear advections of energy and angular momentum, thereby providing a closure of the dynamic system, is presented, on the basis of which a crude estimate of zonal velocity is made. The rigid shell (global average) component on Venus was calculated to be 105 m/sec.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 5; 9, 19
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 4
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    Interaction of Titan's atmosphere with Saturn's magnetosphere (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Voyager 1 measurements made during the Titan flyby reveal that Saturn's rotating magnetospheric plasma interacts directly with Titan's neutral atmosphere and ionosphere. This results from the lack of an intrinsic magnetic field at Titan. The interaction induces a magnetosphere which deflects the flowing plasma around Titan and forms a plasma wake downstream. Within the tail of the induced magnetosphere, ions of ionospheric origin flow away from Titan. Just outside Titan's magnetosphere, a substantial ion-exosphere forms from an extensive hydrogen-nitrogen exosphere. The exospheric ions are picked up and carried downstream into the wake by the plasma flowing around Titan. Mass loading produced by the addition of exospheric ions slows the wake plasma down considerably in the vicinity of the magnetopause.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 5; 4, 19
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 5
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    EOS - The earth observing system of the 1990s (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Attention is given to the deliberations of NASA's Earth Observing System (EOS) Science and Mission Requirements Working Group, which has addressed the requirements and prospects for low earth orbit sensor platforms in the 1990s. The proposed EOS network would link data users with mission data repositories. Three EOS instrument packages have been chosen on the basis of synergistic instrument groupings for making simultaneous observations of selected phenomena over a variety of wavelengths.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE, Proceedings (ISSN 0018-9219); 73; 1025-103
    Format: text
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    NASA TECHNICAL REPORTS
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