Computer Science
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62..344j&link_type=abstract
Icarus (ISSN 0019-1035), vol. 62, May 1985, p. 344-347.
Computer Science
23
Frost, Ganymede, Ion Irradiation, Polar Regions, Surface Reactions, Electron Bombardment, Oxygen, Sputtering, Jupiter, Satellites, Ganymede, Polar Regions, Frost, Formation, Models, Plasma, Bombardment, Reflectance, Icy Bodies, Surface, Characteristics
Scientific paper
Voyager photographs have shown the presence of polar frost on Ganymede, a satellite of Jupiter. A number of models have been proposed for the formation of this feature. The models are based on the transport of material from the equatorial to the polar regions. The present paper is concerned with a model regarding the origin and appearance of the Ganymede caps which does not depend on such a transport. The model is based on observations of the surficial changes produced by ion bombardment. It is pointed out that experiments on ion and electron bombardment of water ice at low temperatures have shown that these particles sputter significant quantities of water molecules. In addition, they also change the visual characteristics of the surface significantly. Ion bombardment competing with thermal reprocessing may be sufficient to explain the latitudinal differences observed on Ganymede.
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