Physics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.1097k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Feb. 1, 1990, p. 1097-1101.
Physics
8
Ion Temperature, Ionospheric Ion Density, Oxygen Ions, Planetary Ionospheres, Supersonic Flow, Venus Atmosphere, Energy Transfer, High Temperature Gases, Resonance Charge Exchange, Venus, Oxygen, Ionosphere, Ions, Flow, Heating, Temperature, Energy, Nightside, Gases, Deposition, Absorption, Calculations, Momentum, Atmosphere, Density
Scientific paper
The column heating rate of the dayside Venus ionospheric ion gas resulting from transfer of energy from the hot oxygen component of the neutral atmosphere is estimated and found equal to that which, when inserted into ionospheric models at the ionopause, raises the calculated temperature to measured values. The transfer of energy is effected through resonant charge exchange between the relatively cold ionospheric O(+) ions and the hot oxygen neutrals. The hot oxygen density in the nightside hemisphere does not appear to play a significant role in the nightside ion energetics. The hot oxygen neutral gas flowing across the terminator from its dayside source to its nightside sink will exchange momentum with the antisunward flowing ionospheric gas. Although the flow rate of hot oxygen can be estimated only crudely, the estimated rate of deposition and absorption is comparable to that produced by the plasma pressure and should be included in numerical studies of the terminator ionospheric wind.
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