Oxygen ionization rates at Mars and Venus: Relative contributions of impact ionization and charge exchange
- 25 February 1993
- journal article
- Published by American Geophysical Union (AGU) in Journal of Geophysical Research
- Vol. 98 (E2) , 3311-3318
- https://doi.org/10.1029/92je02229
Abstract
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.Keywords
This publication has 18 references indexed in Scilit:
- On the problem of the Martian atmosphere dissipation: Phobos: 2 TAUS Spectrometer resultsJournal of Geophysical Research, 1991
- The fast atomic oxygen corona extent of MarsGeophysical Research Letters, 1990
- Aspera/Phobos measurements of the ion outflow from the MARTIAN ionosphereGeophysical Research Letters, 1990
- Hot oxygen atoms in the upper atmospheres of Venus and MarsGeophysical Research Letters, 1988
- Strong electron heating at the Earth's bow shockJournal of Geophysical Research, 1987
- The effect of the hot oxygen corona on the interaction of the solar wind with VenusGeophysical Research Letters, 1987
- Ionization frequencies for solar cycle 21: RevisedJournal of Geophysical Research, 1985
- The Martian ionosphere as observed by the Viking retarding potential analyzersJournal of Geophysical Research, 1977
- Electron Temperature Dependence of Recombination ofandIons with ElectronsPhysical Review B, 1969
- Hydromagnetic flow around the magnetospherePlanetary and Space Science, 1966