Computer Science
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..279s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 34, March 1986, p. 279-291. NSERC-supported research.
Computer Science
19
Exosphere, Kinetic Theory, Mars Atmosphere, Outgassing, Planetary Atmospheres, Atomic Collisions, Boltzmann Transport Equation, Earth Atmosphere, Evaporation, Gas Density, Gas Temperature, Helium Atoms, Hydrogen Atoms, Neutral Atmospheres
Scientific paper
The departure from equilibrium in the exosphere of a planetary atmosphere owing to the loss of energetic atoms is studied with solutions of the Boltzmann equation. A rigorous collisional solution is obtained for a plane parallel model with a newly developed discrete ordinate method, and the decrease in the excape flux relative to Jeans flux is calculated together with density and temperature profiles. The escape of hydrogen and helium atoms from Earth and the escape of hydrogen atoms from Mars is considered. The results are compared with previous studies of the same effect. The departures from equilibrium are largest for the escape of a light species from an atmosphere with a heavy background gas such as for the escape of hydrogen atoms from Mars.
Blackmore R.
Shizgal Bernie
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