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One dimensional direct simulation Monte Carlo (DSMC) simulations are used to examine the effect of a trace non‐condensable species on the freeze‐out dynamics of Io’s sulfur dioxide sublimation atmosphere during eclipse and egress. Due to finite ballistic times, essentially no collapse occurs during the first 10 minutes of eclipse at altitudes above ∼100 km, and hence immediately after ingress auroral emission morphology above 100 km should resemble that of the immediate pre‐eclipse state. In the absence of a non‐condensable species the sublimation SO2 atmosphere will freeze‐out (collapse) during eclipse as the surface temperature drops. However, rapid collapse is prevented by the presence of even a small amount of a perfect non‐condensable species due to the formation of a static diffusion layer several mean free paths thick near the surface. The higher the non‐condensable mole fraction, the longer the collapse time. The effect of a weakly condensable gas species (non‐zero sticking/reaction coefficient) w...

Io’s Atmospheric Freeze-out Dynamics in the Presence of a Non-condensable Species