Physics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..135...79h&link_type=abstract
Icarus, Volume 135, Issue Icarus, pp. 79-94.
Physics
21
Scientific paper
The Galileo ultraviolet spectrometer has measured the first-ever disk-resolved spectral ultraviolet albedos of regions on Europa's trailing and antijovian hemispheres at spatial resolutions approaching 55 km. We find that the ultraviolet albedo (2400-3200 A) increases with distance from the trailing hemisphere apex (270 deg W). Regions close to 270 deg W display an absorption feature centered near 2800 A, which generally decreases with distance from the trailing hemisphere apex. These results substantiate the idea that magnetospheric bombardment darkens the surface of the entire trailing hemisphere and creates an absorber in the central portion of the trailing hemisphere. The absorption is related to sulfur, but is much darker than any laboratory spectra, likely due to the large grain size on Europa's trailing hemisphere. The disk-resolved observations, in combination with three disk-integrated observations, are used to derive the ultraviolet particle scattering function for Europa's trailing hemisphere.
Barth Charles A.
Hendrix Amanda R.
Hord Charles W.
Lane Arthur L.
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