Charge exchange in the Venus ionosphere as the source of the hot exospheric hydrogen

Details Charge exchange in the Venus ionosphere as the source of the hot exospheric hydrogen Charge exchange in the Venus ionosphere as the source of the hot exospheric hydrogen

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7649h&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7649-7656.

Astronomy and Astrophysics

Astronomy

35

Atmospheric Chemistry, Charge Exchange, Exosphere, Hydrogen Atoms, Planetary Ionospheres, Venus Atmosphere, Atmospheric Composition, Atmospheric Models, Hydrogen Ions, Ion Density (Concentration), Ion Temperature, Mathematical Models, Monte Carlo Method, Oxygen, Planetology, Spaceborne Astronomy

Scientific paper

A global Monte Carlo model of the exosphere of Venus, simulating the normal exospheric processes, as well as the production of a 'hot' hydrogen component by charge exchange of H(+) with H and O, has been computed. The resulting altitude profiles of atomic hydrogen concentration over both the day and night hemispheres are in reasonable agreement with Mariner 5 and Mariner 10 observations of Lyman-alpha, showing that the ionospheric charge exchange reactions are a significant source of 'hot' hydrogen, possibly the dominant source. However, the uncertainties in the available atomic hydrogen data allow for production of a similar amount of nonthermal H by chemical processes involving H2 as suggested by Kumar and Hunten (1974).

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