Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7317n&link_type=abstract
HST Proposal ID #7317
Other
Hst Proposal Id #7317 Solar System
Scientific paper
The discovery of O_2 and O_3 in spectra of Ganymede's trailing hemisphere has revealed its icy surface to be an unexpectedly complex and dynamic environment. Europa, exposed to a slightly different radiation environment, has SO_2 on its trailing hemisphere with no trace of either O_3 or O_2. What role is played by plasma composition and energy, surface-ice composition, surface temperature, porosity, global magnetic field, or other possible physical parameters in determining whether oxygen or sulfur-bearing molecules, and how much, will be produced is unknown. Scant existing data on spatial distributions of these molecules suggests that the simplest model, abundance peaking at the antapex of orbital motion and decreasing symmetrically away from that point is inadequate. The new capability to measure spectra at 0.1 arcsec spatial scales offered by STIS gives us the opportunity to address such questions by mapping the distribution of O_3 and OH on Ganymede and SO_2 on Europa. In addition, STIS can obtain the first albedo spectra of these satellites at wavelengths below ~ 210 nm because STIS will not be sensitive to scattered visible light as was the FOS. Understanding the details of how the ice of Europa and Ganymede are chemically processed will help to determine whether ion-surface systems should be expected on other icy satellites outside the Jupiter system.
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