The Composition of Io's Pele Plume

Details The Composition of Io's Pele Plume The Composition of Io's Pele Plume

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9440s&link_type=abstract

HST Proposal ID #9440

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Hst Proposal Id #9440

Scientific paper

We propose to determine the composition of Io's largest volcanic plume, Pele, with unprecedented accuracy. This will give us new constraints on the temperatures, pressures, and magma composition of this volcano, and thus an improved window into Io's interior. We will use the proven Jupiter transit spectroscopy technique, which resulted in the discovery of S_2 gas in the Pele plume, but will use exposures that are 4 times longer than in the discovery observations. This will allow us to accurately measure plume SO_2 abundances, seen only with low S/N in the discovery observations, and possibly SO, in addition to S_2, and gives the chance to discover other, currently unknown, plume components. We will also use ACS to obtain UV and visible images of the Pele plume in reflected light prior to Jupiter transit, to constrain the dust abundance and particle size in the plume. This will allow refined estimates of plume dust/gas ratios and resurfacing rates. We will repeat the observations four times to build up S/N to even higher levels, and to look for time variability in both dust and gas abundance and chemistry.

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