On the thermal process of atomic hydrogen escape from the earth's atmosphere

Details On the thermal process of atomic hydrogen escape from the earth's atmosphere On the thermal process of atomic hydrogen escape from the earth's atmosphere

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..661p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, Oct. 1983, p. 661-666.

Physics

Atmospheric Composition, Atmospheric Physics, Earth Atmosphere, Hydrogen Atoms, Outgassing, Escape, Velocity Distribution

Scientific paper

The authors' approach to the problem of the escape of gases from the planetary gravitational field is close to the consideration by Biutner (1958, 1959) which generalizes results obtained by Jones (1923) for the particular cases of the dense and rarefied atmosphere. The choice of the escape layer, the height distribution of the escape probability as well as escape intensity, have been investigated carefully by Biutner when considering the helium isotope escape from the atmosphere. The objects of the present paper include: (1) to take into account the escape of atomic hydrogen from the bulk atmospheric layer (h approximately 100-1000 km) using present-day data on the composition and temperature distribution in the upper atmosphere (Jacchia, 1977), (2) to find the perturbation of the velocity distribution function in energy space under escape conditions when it is not assumed to be Maxwellian or close to it in the whole dissipation layer and (3) to compare the escape rates obtained under such consideration with the production rates of atomic hydrogen in the atmosphere as well as with local values of the fluxes that are observed. The difference between the results obtained and those of Monte Carlo calculations is attributed to the placing of the lower boundary surface at a lower atmospheric level in the present model.

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