Composition and Heterogeneity of Io's Volcanos from Polarimetry of Their Thermal Emission

Details Composition and Heterogeneity of Io's Volcanos from Polarimetry of Their Thermal Emission Composition and Heterogeneity of Io's Volcanos from Polarimetry of Their Thermal Emission

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7319g&link_type=abstract

HST Proposal ID #7319

Computer Science

Hst Proposal Id #7319 Solar System

Scientific paper

We propose NICMOS measurements of the linear polarization of Io's 2Mum volcanic thermal emission in Jupiter's shadow to study the lava composition and its variation among different hot spots on Io. Goguen and Sinton {1985} used disk- integrated polarimetry of the sunlit Io at 4.8Mum to show that the hot spot emission is strongly polarized and obeys a simple model of polarization by Fresnel transmission across a plane dielectric interface. They deduced both the latitudes and longitudes of hot spots and determined the mean index of refraction of the lava as n=1.51+/-0.07, consistent with silicate compositions {1.341 km for T>600K. Because locations are measured independently and reflected sunlight is eliminated, the polarization of each hot spot uniquely determines its index of refraction. We expect at least 3-10 hot spots on the visible hemisphere at this level, including Loki. The analysis will focus on the composition and its variation among the hot spots and correlate the variation, for example, with hot spot size, temperature and morphology.

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