Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.8436h&link_type=abstract
Journal of Geophysical Research, vol. 84, Dec. 30, 1979, p. 8436-8442.
Physics
6
Energetic Particles, Mars Atmosphere, Natural Satellites, Planetary Atmospheres, Satellite Atmospheres, Sputtering, Alpha Particles, Carbon Dioxide, Ganymede, Monatomic Gases, Protons
Scientific paper
Analytic expressions are presented which may be used to compute the sputter-erosion yield from any unimolecular gravitationally bound gas by any atomic charged particle of any energy. A calculation of solar wind proton and alpha particle induced erosion of the CO2 atmosphere of Mars predicts molecular sputtering yields. An expression for the emission yield of energetic molecular fragments produced in primary knock-on events is given in closed form; such fragment emission is of secondary importance for mass loss compared to the molecular yield itself. Erosion by radiation belt protons of a hypothetical thin O2 atmosphere associated with the Jovian satellite Ganymede is considered, and molecular sputtering yields for proton energies are determined.
Haff Peter K.
Watson Christer
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