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Alteration of the UV-visible reflectance spectra of H2O ice by ion bombardmentSatellite 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.
Document ID
19910070167
Document Type
Reprint (Version printed in journal)
Authors
Sack, N. J. (Virginia Univ. Charlottesville, VA, United States)
Boring, J. W. (Virginia Univ. Charlottesville, VA, United States)
Johnson, R. E. (Virginia Univ. Charlottesville, VA, United States)
Baragiola, R. A. (Virginia Univ. Charlottesville, VA, United States)
Shi, M. (Virginia, University Charlottesville, United States)
Date Acquired
August 14, 2013
Publication Date
September 25, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAGW-2046
CONTRACT_GRANT: NAGW-186
CONTRACT_GRANT: NSF AST-88-17700
Distribution Limits
Public
Copyright
Other