Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3939c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 1, 1984, p. 3939-3944.
Physics
34
Io, Molecular Gases, Oxygen, Satellite Atmospheres, Sputtering, Sulfur, Atmospheric Models, Charged Particles, Molecular Ions, Sulfur Dioxides, Jupiter, Satellites, Io, Sulfur, Oxygen, Escape, Charged Particles, Sputtering, Corotation, Ions, Flux, Sulfur Dioxide, Voyager Missions, Torus, Atmosphere, Models, Ionization, Dissociation, Coronas, Diffusion, Mixing
Scientific paper
Charged particle sputtering is reexamined as a mechanism for escape of sulfur and oxygen from Io. Corotating ions and energetic ions are considered, using the best available determinations of ion fluxes and sputtering yields. It is unclear whether molecular SO2 is the dominant escaping neutral from Io or whether atomic O and S are dominant, but the Voyager detection of SO2+ in the cold torus implies the presence of molecular SO2 there. Thin atmosphere models encounter serious difficulty in achieving adequate sulfur and oxygen escape rates, but they are not yet ruled out. Ionization and dissociation of SO2 in a sputter corona can dominate direct escape. In thick atmosphere models the neutral escape rates can be much higher, but the oxygen escape rate tends to be too high relative to the sulfur escape rate unless diffusive separation in the atmosphere is limited, perhaps by rapid mixing.
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