Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617535s&link_type=abstract
(International Conference on Laboratory Research for Planetary Atmospheres, 2nd, Charlottesville, VA, Oct. 21, 1990, Proceedings
Physics
16
Icy Satellites, Ion Impact, Satellite Atmospheres, Spectral Reflectance, Ultraviolet Spectra, Visible Spectrum, Atmospheric Chemistry, Europa, Ganymede, Microstructure, Planetary Magnetospheres
Scientific paper
Satellite in the Jovian and Saturnian system exhibit differences in reflectivity between their 'leading' and 'trailing' surfaces which can affect the local vapor pressure. Since these differences are thought to be due to differences in the flux of bombarding magnetospheric ions, the influence of ion impact on the UV-visible reflectance of water ice surfaces (20-90 K) by keV ion bombardment was studied. An observed decrease in reflectance in the UV is attributed to rearrangement processes that affect the physical microstructure and surface 'roughness'. The ratio in reflectance of bombarded to freshly deposited films is compared to the ratio of the reflectance of the leading and trailing hemispheres for Europa and Ganymede.
Baragiola Raúl A.
Boring J. W.
Johnson Robert E.
Sack Norbert J.
Shi Ming
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