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The ancient oxygen exosphere of Mars: Implications for atmosphere evolutionThis study involves the calculation, by the 2-stream method of Nagy and Cravens, of 'hot' oxygen exosphere density profiles for 'ancient' atmospheres and ionospheres (e.g., different extreme ultraviolet fluxes) and the associated escaping fluxes. We computed the total production rates above different 'nominal' ionopause altitudes (not taking into account the fact that some will reenter the atmosphere). We do not consider the additional neutral escape due to the sputtering process described by Luhmann and Kozyra. The results presented here thus represent conservative estimations of the neutral escape fluxes, but generous estimates of ion loss rates (except that here we do not consider charge exchange and impact ionization ion production processes). Further work along the lines of Luhmann and Kozyra can lead to estimates of sputtering losses over time and the roles played by impact ionization and charge exchange.
Document ID
19920019837
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Zhang, M. H. G.
(California Univ. Los Angeles, CA, United States)
Luhmann, J. G.
(California Univ. Los Angeles, CA, United States)
Nagy, A. F.
(Michigan Univ. Ann Arbor., United States)
Bougher, S. W.
(Arizona Univ. Tucson., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Lunar and Planetary Inst., Workshop on the Martian Surface and Atmosphere Through Time
Subject Category
Lunar And Planetary Exploration
Accession Number
92N29080
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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