Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...24..411f&link_type=abstract
Icarus, vol. 24, Apr. 1975, p. 411-420.
Astronomy and Astrophysics
Astronomy
26
Astronomical Spectroscopy, Ice, Infrared Spectra, Planetary Temperature, Spectral Reflectance, Temperature Measurement, Brightness Temperature, Calibrating, Europa, Natural Satellites, Planetary Radiation, Polar Caps, Saturn Rings, Temperature Effects
Scientific paper
Reflection spectra of water ice from 1 to 4 microns are presented as a function of temperature. It is found that a feature at 6056 reciprocal cm changes its intensity sufficiently so that it can be used as a spectroscopic measurement of the ice temperature. A temperature calibration curve of this feature down to 55 K is developed and used to determine ice temperatures for the Galilean satellites Europa (95 + or -10 K), Ganymede (103 + or -10 K), and the rings of Saturn (80 + or -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.
Fink Uwe
Larson Harold P.
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