Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.1709s&link_type=abstract
American Astronomical Society, DPS meeting #35, #17.09; Bulletin of the American Astronomical Society, Vol. 35, p.1484
Mathematics
Logic
Scientific paper
Galileo NIMS spectral data of the surface of the Jovian satellite Ganymede exhibit absorption bands which have been attributed to water ice. The influence of additional surface components other than water ice shifts the wavelength positions of maximum absorbance in these spectral regions. Variations of band positions near 1.5, 2.0 and 3.0 microns are used to map their spatial distribution in contrast to geological units across the surface of the satellite. By combining spectral information with albedo and morphological information based on Galileo SSI images, the spatial distribution of distinct band shifts near 2 and 3 microns could be correlated with geological units across the satellite's surface indicating variations of the water ice/hydrated non-ice material ratio to pure water ice. However, in the case of the absorption band near 1.5 microns only small band shifts occur, which show no recognizable correlations with different geological units and are supposed to be less sensitive for changes in surface composition because of less band saturation compared to absorption bands near 2 and 3 microns. Only major parts of the trailing and leading hemispheres exhibit band positions that are at distinctly shorter wavelengths compared to other locations on Ganymede's surface. More large grained water ice caused by micrometeoritic bombardement and magnetospheric sputtering dominates the trailing and leading side, respectively. The more saturated water ice bands of larger grained ice are more sensitive for compositional changes and could explain the observed band positions.
Hansen Gary B.
Hibbitts Ch. A.
Stephan Karl
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