Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10269s&link_type=abstract
HST Proposal ID #10269
Physics
Hst Proposal Id #10269 Solar System
Scientific paper
We propose disk-resolved 2000-3150 A spectroscopy of Io's unique SO2 atmosphere in order to test the relative importance of volcanism and frost sublimation in supporting the atmosphere. This is important for answering such basic questions as the extent to which the atmosphere collapses at night. If it does collapse, it is the only substantial atmosphere in the solar system to behave in this manner. Our observations will target low-latitude regions away from active plumes {in contrast to our Cycle 10 observations which targeted the Prometheus plume}, to look for the effect of plumes on the atmosphere. We will also look at the variation of low-latitude atmospheric abundance with terrain type, to look for explanations for the large longitudinal variations in atmospheric pressure seen in earlier data. Finally, we will look at a variety of regions at two different times of day to determine the extent of diurnal variations in the atmosphere, which are expected if the atmosphere is dominantly supported by frost sublimation.
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