The Distribution of Sulfur Dioxide and Other Infrared Adsorbers on the Surface of Io from Galileo NIMS

Details The Distribution of Sulfur Dioxide and Other Infrared Adsorbers on the Surface of Io from Galileo NIMS The Distribution of Sulfur Dioxide and Other Infrared Adsorbers on the Surface of Io from Galileo NIMS

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.0907c&link_type=abstract

American Astronomical Society, DPS meeting #29, #09.07; Bulletin of the American Astronomical Society, Vol. 29, p.979

Astronomy and Astrophysics

Astronomy

Scientific paper

The Galileo Near Infrared Mapping Spectrometer (NIMS) was used to investigate the distribution and relative particle size variations of sulfur dioxide over one hemisphere of Io, centered at 210deg W. Using bands of differing strength, we find that large SO2 grains (diameter of order 500 mu m) are prevalent in the equatorial region of Colchis Regio and that smaller-sized particles occur almost everywhere, but with spatially variable concentrations. The exception is volcanic hot spots, where high surface temperatures promote rapid vaporization and produce SO2-free areas. The high-latitude abundance of total sulfur dioxide exceeds that found in equatorial regions. A feature at 3.15 mu m, perhaps due to an O-H stretch transition, is equatorially distributed and similiarly absent in hot spots. A broad adsorption in the 1 mu m region, which may be produced by iron-containing silicates, shows a concentration at Io's southern polar region, with an absence in the Pele plume deposition ring.

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