Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..195t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 1, 1987, p. 195-207.
Astronomy and Astrophysics
Astronomy
Atmospheric Models, Io, Satellite Atmospheres, Sulfur Dioxides, Atmospheric Temperature, Condensation, Polar Caps, Sublimation, Surface Temperature, Vapor Pressure, Jupiter, Satellites, Io, Condensation, Sublimation, Atmosphere, Models, Equilibrium, Vapor Pressure, Sulfur Dioxide, Surface, Temperature, Flux, Diffusion, Polar Regions, Deposition, Polar Caps, Gases, Sputtering, Calculations, Formation
Scientific paper
A numerical model of the atmosphere of the Galilean satellite, Io, is described. This model is based on the equilibrium vapour pressure of SO2 at the surface temperature and includes condensation, sublimation and diffusion processes. The model is subsequently used to determine polar deposition rates for a number of examples. It is concluded from the deposition rates that a background non-condensable gas cannot prevent SO2 gas condensing at the poles to form bright polar caps. It is also shown that reduction of the poleward flux by cold-trapping in addition to gas blocking fails to explain the dark nature of the caps. Consequently, sputtering of the poles must be occurring.
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