Plasma-gas interactions in planetary atmospheres and their relevance for the terrestrial hydrogen budget

Details Plasma-gas interactions in planetary atmospheres and their relevance for the terrestrial hydrogen budget Plasma-gas interactions in planetary atmospheres and their relevance for the terrestrial hydrogen budget

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgzg...56...34n&link_type=abstract

Journal of Geophysics - Zeitschrift für Geophysik (ISSN 0340-062X), vol. 56, Dec. 1984, p. 34-46.

Physics

Geophysics

Charge Exchange, Hydrogen, Particle Collisions, Planetary Atmospheres, Plasma Interactions, Terrestrial Planets, Atomic Collisions, Distribution Functions, Gas Density, Integral Equations, Ionic Collisions, Positive Ions

Scientific paper

A theoretical model of H escape from the earth atmosphere is developed to evaluate the roles of charge-exchange processes (CEP) and thermal-loss mechanisms. The model comprises a transition layer at altitude 300-800 km in which H atoms collide elastically with O atoms and O(+) and H(+) ions and an upper region between 800 km and the plasmapause in which elastic collisions are ignored in favor of local CEP production of escaping particles, but the spherical geometry of the region is taken into account. The model predictions are presented graphically as altitude profiles of H density, H temperature, and escape flux and compared with values obtained by ignoring the CEP contribution. Inclusion of CEP is shown to increase the scale height while reducing the density decrease and the temperature. The contribution of CEP to the H escape flux is found to be negative below about 1000 km and positive above that height, constituting about 70 percent of the overall escape flux of several times 10 to the 7th atoms/sq cm sec.

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