Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9211m&link_type=abstract
HST Proposal ID #9211
Physics
Hst Proposal Id #9211 Solar System
Scientific paper
We request archival funding to analyse and publish three years of GHRS observations of Io's far-ultraviolet emissions acquired on 8 dates in 1994--1996. At present none of these data have been quantitatively analysed and published. Determination of the brightness and variability of the 10 sulfur and oxygen emission multiplets produced in the strong electrodynamic interaction of Jovian magnetospheric plasma with Io's upper atmosphere will allow us to determine the density of sulfur and oxygen in the atmosphere, and the ratio of sulfur to oxygen, which will provide a unique constraint for both the Io atmospheric models and the 3-d MHD models of the plasma interaction with the satellite. Io's electron- impact excited emissions provide the only direct, remotely observable tracer of this interaction. The ratio of sulfur to oxygen is also a critical input parameter to models of the Io plasma torus that at present has no observed constraint. Analysis of the emission spectra also allows determination of basic plasma diagnostic parameters such as electron density and temperature. The brightness of Io's emissions will also be correlated with the brightness of the auroral spot at the foot of the magnetic field lines connecting Io to the Jupiter atmosphere as measured from HST UV images.
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