Abstract
Large scale rarefied gas dynamic effects are found in the tenuous atmospheres of several planets and satellites in our Solar System. These phenomena range from thickened shock structures in supersonic flows, to strong thermal nonequilibrium in a stratified atmosphere, to thermal and velocity slip at the body surface. Sublimated atmospheric components in particular are dominated by the detailed nature of the gas-surface interaction. Some direct simulation Monte Carlo (DSMC) results for global scale flows on the Jovian moon Io are presented to illustrate key phenomena in both the sublimated and the volcanic plume components of the atmosphere. The simulations stretch the limits of applicability of DSMC; computational approaches beyond those limits are described.
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