Thermal and Energy Balance Measurements of Saturn's C Ring

Details Thermal and Energy Balance Measurements of Saturn's C Ring Thermal and Energy Balance Measurements of Saturn's C Ring

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7468s&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7468

Physics

Scientific paper

Infrared measurements of Saturn's rings were obtained by the Voyager infrared interferometer spectrometer (IRIS) during the Voyager 1 and 2 flybys in the early 1980's. We have analyzed IRIS observations of the lit and unlit C ring to derive ring brightness temperatures and optical depths. Low phase observations of the outer C ring produce similar optical depths and slightly higher temperatures than high phase observations. A noticeable radial temperature variation is also present in the unlit radial profile of the C ring. Saturn's contribution alone cannot account for the magnitude of the observed temperature variation in this case, even though its contribution is not negligible in the C ring. A radial variation in the Bond albedo appears necessary. The inner C ring is both darker and warmer than the outer C ring. This work was performed at JPL under contract with NASA and at CEA Saclay supported by the ``Programme National de Planetologie".

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