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  • LUNAR AND PLANETARY EXPLORATION  (3)
  • 1990-1994  (3)
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  • 1990-1994  (3)
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  • 1
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    Momentum transfer collision frequency of O(+)-O (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The interaction of the thermosphere and ionosphere is largely governed by collisions between ions and neutral particles. On Venus and the Earth, O(+) is a dominant ion, and atomic O dominates throughout much of the thermosphere; therefore an accurate O(+)-O cross section is an important prerequisite for understanding the dynamics of planetary upper atmospheres. The cross section and momentum transfer collision frequency are calculated with a quantum mechanical code which includes resonance charge exchange, polarization, and charge-quadrupole effects. Our results agree well with earlier calculations of Stubbe (1968) and Stallcop et al. (1991).
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 13; p. 1343-1346.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Thermospheric gravity waves - Observations and interpretation using the transfer function model (TFM) (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: This paper presents some numerical experiments performed with the TFM to study the various wave components excited in the auroral regions that propagate through the thermosphere and lower atmosphere, and to demonstrate the properties of realistic source geometries. The model is applied to the interpretation of satellite measurements, and gravity waves seen in the thermosphere of Venus are discussed. Gravity waves are prominent in the terrestrial thermosphere polar region and can be excited by perturbations in Joule heating and Lorentz force due to magnetospheric processes. Observations from the Dynamics Explorer-2 satellite are used to illustrate the complexity of the phenomenon and to review the TFM that is utilized.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Space Science Reviews (ISSN 0038-6308); 54; 297-375
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    NASA TECHNICAL REPORTS
  • 3
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    Properties of thermospheric gravity waves on earth, Venus and Mars (1992)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A spectral model with spherical harmonics and Fourier components that can simulate atmospheric perturbations in the global geometry of a multiconstituent atmosphere is presented. The boundaries are the planetary surface where the transport velocities vanish and the exobase where molecular heat conduction and viscosity dominate. The time consuming integration of the conservation equations is reduced to computing the transfer function (TF) which describes the dynamic properties of the medium divorced from the complexities in the temporal and horizontal variations of the excitation source. Given the TF, the atmospheric response to a chosen source distribution is then obtained in short order. Theoretical studies are presented to illuminate some properties of gravity waves on earth, Venus and Mars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Chapman Conference; Jun 04, 1990 - Jun 08, 1990; Balatonfured; Hungary
    Format: text
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    NASA TECHNICAL REPORTS
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