Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3311z&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E2, p. 3311-3318.
Physics
67
Atmospheric Ionization, Ion Production Rates, Mars Atmosphere, Oxygen Ions, Planetary Ionospheres, Venus Atmosphere, Charge Exchange, Electron Impact, Photoionization, Planets, Mars, Venus, Terrestrial Planets, Oxygen, Ionization, Ions, Impact Effects, Production Rate, Ionosphere, Ionopause, Photoionization, Charge Exchange, Solar Wind, Electrons, Origin, Formation, Exosphere, Temperature, Model, Comparisons, Bowshock
Scientific paper
Oxygen ion production rates above the ionopauses of Venus and Mars are calculated for photoionization, charge exchange, and solar wind electron impact ionization processes. The latter two require the use of the Spreiter and Stahara (1980) gas dynamic model to estimate magnetosheath velocities, densities, and temperatures. The results indicate that impact ionization is the dominant mechanism for the production of O(+) ions at both Venus and Mars. This finding might explain both the high ion escape rates measured by Phobos 2 and the greater mass loading rate inferred for Venus from the bow shock positions.
Luhmann Janet G.
Nagy Andrew F.
Spreiter John R.
Stahara Stephen S.
Zhang Martina H. G.
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