Physics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9414971y&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Oct. 20, 1989, p. 14971-14989.
Physics
17
Atmospheric Chemistry, Deuterium, Earth Atmosphere, Hydrogen, Exosphere, Flux Quantization, Outgassing, Photochemical Reactions, Reaction Kinetics
Scientific paper
A 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.
Allen Mark
Hsu Kuang-Jung
Landry Bridget M.
Moses Julianne I.
Wen Jun-Shan
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