Supersonic meteorology of Io - Sublimation-driven flow of SO2

Details Supersonic meteorology of Io - Sublimation-driven flow of SO2 Supersonic meteorology of Io - Sublimation-driven flow of SO2

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...64..375i&link_type=abstract

Icarus (ISSN 0019-1035), vol. 64, Dec. 1985, p. 375-390. NASA-supported research.

Computer Science

46

Atmospheric Circulation, Io, Satellite Atmospheres, Sublimation, Sulfur Dioxides, Supersonic Flow, Atmospheric Pressure, Atmospheric Temperature, Diurnal Variations, Hydraulics

Scientific paper

The horizontal flow of SO2 gas from the day side to the night side of IO is calculated on the basis of a hydrodynamic model. The flow speed is found to be supersonic for all realistic values of the parameters. The surface pressure follows the frost vapor pressure within a factor of 2 in spite of day-night pressure ratios of 10,000 or more. Atmospheric temperature is generally below the surface temperature due to decompression in the expanding flow. The greatest sensitivity of the solution is connected with the frost temperature at the subsolar point. The quantities that involve the mass of the atmosphere (density, pressure, mass transport, and condensation rate) all vary as the vapor pressure of the frost, which is a sensitive function of frost temperature.

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