Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2301h&link_type=abstract
American Astronomical Society, DPS meeting #39, #23.01; Bulletin of the American Astronomical Society, Vol. 39, p.451
Other
Scientific paper
Measurements of eruption temperatures on Io are crucial because they provide our best clues to the composition of the magma. High color temperatures indicative of ultramafic composition have been reported for the Pillan hot spot and possibly for Pele, although recent work has called into question the requirement for magma temperatures above those expected for ordinary basalts. We report a reanalysis of the temperatures at Pele, based partially on a previously unanalyzed wavelength channel from the Galileo Near-Infrared Mapping Spectrometer (NIMS). The detector for the 1.87 micron channel degraded during flight, resulting in low sensitivity and causing it to be excluded from some of the standard NIMS data products. However at Pele the low sensitivity provides an advantage in that it remains unsaturated when other adjacent channels are. Tests of this channel using other observations show that despite the degraded sensitivity, the measurements are reliable. Analysis of Pele data near the peak of the hot spot using this channel shows color temperatures near the upper end of the basalt range during the I27 and I32 encounters. Those color temperatures are now being analyzed in terms of lava cooling models to determine the required magma temperatures.
Howell Robert R.
Lopes Rosaly M.
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