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Hydrogen and deuterium loss from the terrestrial atmosphere - A quantitative assessment of nonthermal escape fluxesA comprehensive one-dimensional photochemical model extending from the middle atmosphere (50 km) to the exobase (432 km) has been used to study the escape of hydrogen and deuterium from the earth's atmosphere. The model incorporates recent advances in chemical kinetics as well as atmospheric observations by satellites, especially the Atmosphere Explorer C satellite. The results suggest that the escape fluxes of both H and D are limited by the upward transport of total hydrogen and total deuterium at the homopause. About one fourth of total hydrogen escape is thermal, the rest being nonthermal. It is shown that escape of D is nonthermal and that charge exchange and polar wind are important mechanisms for the nonthermal escape of H and D.
Document ID
19900027246
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Yung, Yuk L.
(California Inst. of Tech. Pasadena, CA, United States)
Wen, Jun-Shan
(California Inst. of Tech. Pasadena, CA, United States)
Moses, Julianne I.
(California Inst. of Tech. Pasadena, CA, United States)
Landry, Bridget M.
(California Inst. of Tech. Pasadena, CA, United States)
Allen, Mark
(California Institute of Technology Pasadena, United States)
Hsu, Kuang-Jung
(JPL Pasadena, CA, United States)
Date Acquired
August 14, 2013
Publication Date
October 20, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
90A14301
Funding Number(s)
CONTRACT_GRANT: NAGW-1538
Distribution Limits
Public
Copyright
Other

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