The equilibrium of atmospheric sodium

Details The equilibrium of atmospheric sodium The equilibrium of atmospheric sodium

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1607h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 12, p. 1607-1614.

Computer Science

2

Atmospheric Composition, Molecular Ions, Satellite Surfaces, Sodium Compounds, Toroidal Plasmas, Earth Atmosphere, Lunar Atmosphere, Mercury Atmosphere, Satellite Atmospheres

Scientific paper

We now have four examples of planetary objects with detectable sodium (and potassium) in their atmospheres: Earth, Io, Mercury and the moon. After a summary of the observational data, this survey discusses proposed sources and sinks. It appears that Io's surface material is rich in frozen SO2, but with around 1 percent of some sodium compound. The Io plasma torus contains ions of S, O and Na, also with at least one molecular ion containing Na. In turn, impact by these ions probably sustains the torus, as well as an extended neutral corona. A primary source for the Earth, Mercury and the moon is meteoroidal bombardment; at Mercury and perhaps the moon it may be supplemented by degassing of atoms from the regolith. Photoionization is important everywhere, although hot electrons are dominant at Io.

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