Galileo's Upcoming View of Io--A Set of Predictions

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Scientific paper

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Galileo, Heat Flow, Io, Sulfur Dioxide, Volcanism

Scientific paper

Many studies of Io have been done since the Voyager flybys. We have extrapolated from these to predict how Io may have changed during the 16 years since the Voyager flybys. We expect that Io's global heat flow will be about 1014 W, or about 2.5 W m-2. There will be numerous thermal anomalies and they will be consistent with basaltic-type volcanism. Many small, hot sources (e.g., temperatures greater than 600 K and diameters of a few tens of kilometers) will appear and quickly fade. Up to ten percent of Io's surface may be affected by new lava flows since Voyager. SO2 gas will be concentrated locally in plumes and other vents. During daytime, large frost covered regions will be cooler than expected possibly due to solid-state greenhousing and will effectively trap mospheric SO2.

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