Wind enhanced planetary escape - Collisional modifications

Details Wind enhanced planetary escape - Collisional modifications Wind enhanced planetary escape - Collisional modifications

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1206c&link_type=abstract

Journal of Geophysical Research, vol. 82, Mar. 1, 1977, p. 1206-1210.

Physics

1

Atmospheric Diffusion, Atomic Collisions, Helium, Hydrogen Atoms, Monte Carlo Method, Wind Effects, Escape Velocity, Exosphere, Gaseous Diffusion, Methane, Thermosphere, Titan

Scientific paper

Effects of collisions and finite winds characteristic of a highly perturbed atmosphere on the thermal escape of terrestrial hydrogen and helium are investigated using a Monte Carlo approach. The limiting cases of vertical and horizontal winds are considered, and the relaxation layer between the collisionless exosphere and the collision-dominated thermosphere is modeled as a plane-parallel slab of given column density, depth, and atmospheric density. For both gases, the upwardly injected flux at the base of the relaxation layer is compared with the returning downward flux distribution at the same location; the technique is also applied to the atmosphere of Titan. The results show that inclusion of collisions in the escape model for terrestrial hydrogen with winds effectively throttles the escape process, that collisional throttling is negligible for helium when the exobase temperature is at least 5000 K, and that the escape of a planetary-atmosphere constituent depends on the ratio of its gravitational and kinetic energies as well as on the ratio of its mass to that of the background gas.

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