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Oxygen ionization rates at Mars and Venus - Relative contributions of impact ionization and charge exchangeOxygen 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.
Document ID
19930046758
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Zhang, M. H. G.
(Austrian Academy of Sciences, Space Research Inst., Graz, Austria; California Univ. Los Angeles, United States)
Luhmann, J. G.
(California Univ. Los Angeles, United States)
Nagy, A. F.
(Michigan Univ. Ann Arbor, United States)
Spreiter, J. R.
(Stanford Univ. CA, United States)
Stahara, S. S.
(RMA Aerospace, Inc. Mountain View, CA, United States)
Date Acquired
August 16, 2013
Publication Date
February 25, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: E2
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
93A30755
Funding Number(s)
CONTRACT_GRANT: NASW-4335
CONTRACT_GRANT: NAGW-1347
CONTRACT_GRANT: NAGW-2491
CONTRACT_GRANT: NASW-4413
CONTRACT_GRANT: NAGW-1790
Distribution Limits
Public
Copyright
Other

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