Reduced hydrogen temperatures in the transition region between thermosphere and exosphere

Details Reduced hydrogen temperatures in the transition region between thermosphere and exosphere Reduced hydrogen temperatures in the transition region between thermosphere and exosphere

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ang....32..277f&link_type=abstract

Annales de Geophysique, vol. 32, July-Sept. 1976, p. 277-282.

Mathematics

Logic

Exosphere, Hydrogen, Rarefied Gas Dynamics, Temperature Profiles, Thermosphere, Transition Layers, Differential Equations, Maxwell-Boltzmann Density Function, Oxygen, Vertical Distribution

Scientific paper

A phenomenological approach is taken to the description of gas dynamics (hydrogen escape) in the transition layer between the thermosphere and the exosphere. It is found that for the requirement of heat flux conservation in the transition layer to be fulfilled, the hydrogen temperature must be considerably lower than the oxygen temperature. A smaller escape rate than that of Jeans is predicted on the basis of this low hydrogen temperature. The geocoronal hydrogen distribution is thus characterized by a hydrogen scale height considerably smaller than heretofore assumed.

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