Computer Science
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11186s&link_type=abstract
HST Proposal ID #11186. Cycle 16
Computer Science
Scientific paper
We propose to explore the spatial structure and temporal variability of Europa's O2 atmosphere with ACS/SBC. Previous HST images display non-uniform UV emission from Europa's atmosphere, which maximizes within the disk of Europa on its anti-Jovian northern quadrant. These images were taken at western elongation and are not conclusive, but bring up the exciting question whether the non-uniform emission is due to a locally enhanced neutral atmosphere. A locally inhomogeneous atmosphere would imply locally modified surface properties. This might provide clues on inhomogeneities of the underlying ice structure and thus properties of a potential subsurface ocean. Since the inhomogeneous emission comes from within the disk of Europa, we propose to study Europa at eastern and western elongation to decide if the locally enhanced emission is truly an atmospheric effect. We propose to take for each elongation five contiguous observations within one rotation period of Jupiter to discriminate between a competing effect that produces inhomogeneous emission patterns, i.e., the electrodynamic interaction with Jupiter's magnetosphere. We will use ACS/SBC with PR130L prism to completely separate the two prominent FUV oxygen lines OI 1304 A and OI 1356 A emitted from Europa's atmosphere.;
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