Temperature dependence of the water-ice spectrum between 1 and 4 microns: Application to Europa,Ganymede and Saturn's rings |
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| Authors: | Uwe Fink Harold P Larson |
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| Institution: | Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721, USA |
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| Abstract: | Reflection spectra of water ice from 1 to 4 μm are presented as a function of temperature. It is found that a feature at 6056 cm?1 changes its intensity sufficiently that it can be used as a spectroscopic measure of the ice temperature. A temperature calibration curve of this feature down to 55 K is developed and is used to determine ice temperatures for the Galilean satellites Europa (95±10 K), Ganymede (103±10 K), and the rings of Saturn (80±5 K). The ice temperatures for the Galilean satellites are lower than their measured brightness temperatures, which can be explained by a higher albedo of the ice covered regions relative to the rest of the satellite and possibly a concentration of the ice near the polar caps. |
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