The effect of 'external' sources and dissipative processes on the abundance of inert gases in the atmospheres of the earth-group planets

Details The effect of 'external' sources and dissipative processes on the abundance of inert gases in the atmospheres of the earth-group planets The effect of 'external' sources and dissipative processes on the abundance of inert gases in the atmospheres of the earth-group planets

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981izssr..45..621p&link_type=abstract

(Evropeiskii Simpozium po Kosmicheskim Lucham, 7th, Leningrad, USSR, Sept. 15-19, 1980.) Akademiia Nauk SSSR, Izvestiia, Seriia

Other

Abundance, Atmospheric Composition, Interplanetary Gas, Planetary Atmospheres, Planetary Evolution, Rare Gases, Terrestrial Planets, Argon Isotopes, Helium, Interplanetary Dust, Mars Atmosphere, Mercury (Planet), Solar Wind, Thermal Diffusivity

Scientific paper

It is shown that the influx of He, Ne, and Ar-36 into the atmospheres of Mars and Mercury from 'external' (i.e., interplanetary) sources is significant and requires the existence of special mechanisms to explain the observed concentrations in the atmospheres. For the Mars atmosphere, the most probable mechanism for Ne and Ar-36 losses is dissipation arising in the interaction of the atmosphere with the solar wind during periods of anomalously low temperatures. For Mercury, thermal dissipation for He and the polar wind for other inert gases are considered to be the probable mechanisms. It is also shown that, for other earth-group planets, dissipation arising in the interaction with the solar wind and the influx of inert gases with interplanetary dust could have played an important role in the early stages of planetary evolution.

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