Physics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988icar...76..135i&link_type=abstract
Icarus (ISSN 0019-1035), vol. 76, Oct. 1988, p. 135-145.
Physics
74
Coronas, Mars Atmosphere, Oxygen Atoms, Oxygen Ions, Planetary Ionospheres, Recombination Reactions, Gravitational Effects, Phobos, Solar Terrestrial Interactions, Venus Atmosphere, Water Vapor
Scientific paper
Electron dissociative recombination of O2(+) ions in the Venus ionosphere, which may be an important source of suprathermal atomic oxygen, is presently considered as a factor in the Mars exosphere; due to the weaker surface gravitational attraction of Mars, a hot oxygen corona thus formed would be denser than that of Venus at altitudes greater than 2000 km despite Mars' lower ionospheric content. If such an extended oxygen corona does exist on Mars, its collisional interaction with Phobos would lead to the formation of an oxygen gas torus whose average number density is of the order of only 1-2/cu cm along the Phobos orbit.
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