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Nonthermal escape of hydrogen and deuterium from Venus and implications for loss of waterAs the dominant nonthermal mechanism for the escape of hydrogen in past Venus atmospheres, the charge exchange of H(+) with H would have provided an escape flux close to the diffusion-limiting value for H-mixing ratios up to 0.002 at the homopause, which also marks the onset of hydrodynamic flow. Charge exchange therefore represents a viable mechanism through which Venus could have lost up to an earth-equivalent ocean of water from its atmosphere over geologic time. Present Venus atmosphere estimates are based on in situ Pioneer Venus mission measurements, and assumptions in the course of extrapolation to past atmospheres have been with respect to the nature of the bulge, circulation pattern, and ion temperature.
Document ID
19830065863
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kumar, S.
(Southern California, University Los Angeles, CA, United States)
Hunten, D. M.
(Arizona, University Tucson, AZ, United States)
Pollack, J. B.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 11, 2013
Publication Date
September 1, 1983
Publication Information
Publication: Icarus
Volume: 55
ISSN: 0019-1035
Subject Category
Lunar And Planetary Exploration
Accession Number
83A47081
Funding Number(s)
CONTRACT_GRANT: NCA2-OR-730-101
CONTRACT_GRANT: NSG-7558
CONTRACT_GRANT: NAGW-57
Distribution Limits
Public
Copyright
Other

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