Hot spots on Io: Initial results from Galileo's near infrared mapping spectrometer

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Abstract

The Near-Infrared Mapping Spectrometer on Galileo has monitored the volcanic activity on Io since June 28, 1996. This paper presents preliminary analysis of NIMS thermal data for the first four orbits of the Galileo mission. NIMS has detected 18 new hot spots and 12 others which were previously known to be active. The distribution of the hot spots on Io's surface may not be random, as hot spots surround the two bright, SO2-rich regions of Bosphorus Regio and Colchis Regio. Most hot spots seem to be persistently active from orbit to orbit and 10 of those detected were active in 1979 during the Voyager encounters. We report the distribution of hot spot temperatures and find that they are consistent with silicate volcanism. Copyright 1997 by the American Geophysical Union.

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Lopes-Gautier, R., Davies, A. G., Carlson, R., Smythe, W., Kamp, L., Soderblom, L., … Mehlman, R. (1997). Hot spots on Io: Initial results from Galileo’s near infrared mapping spectrometer. Geophysical Research Letters, 24(20), 2439–2442. https://doi.org/10.1029/97GL02662

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