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Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.8007s&link_type=abstract
HST Proposal ID #8007
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Hst Proposal Id #8007 Solar System
Scientific paper
We propose to reanalyse GHRS, FOS and WFPC2 data on the Io plasma torus in light of new models and new theories for its energy supply. Our first goal is to use the archival datasets to build on the 3-D torus model derived from our Cycle 5 program {GO6027}. Some of the archival observations sampled wavelengths and locations similar to those of GO6027, allowing a rigorous search for UV variability indicative of varying mass and energy supply. Other observations sampled different emissions which will discriminate between several energy supply scenarios in our model. Our second goal is a definitive test of a new theory for torus energy input which predicts that virtually all the emission comes from a narrow region unresolved by groundbased or Voyager observations. Measurements or upper limits from WFPC2 images will provide a straightforward test of this hypothesis. The proposed tasks do not repeat those proposed with the original observations, and will significantly expand the scientific return of the original programs and our own GO program.
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