Io's thermal anomalies: Clues to their origins from comparison of ground based observations between 1 and 20 micron

Details Io's thermal anomalies: Clues to their origins from comparison of ground based observations between 1 and 20 micron Io's thermal anomalies: Clues to their origins from comparison of ground based observations between 1 and 20 micron

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2459b&link_type=abstract

Geophysical Research Letters, vol. 24, p. 2459

Physics

4

Thermal Emission, Extraterrestrial Environments, Atmospheric Temperature, Photometry, Radiometers, Imaging Techniques, Volcanoes, Space Probes, Atmospheric Radiation

Scientific paper

Io's thermal emission for 1995 from eclipse photometry at 2.2 micron; broad band radiometry at 4.8 micron, 8.7 micron and 20 micron; and in eclipse imaging between 1.7 and 5 micron are compared. The variability of thermal emission from Io at wavelengths between 1-5 micron is in agreement with the expected variability based on the 13 year record presented in Veeder et al. (1994) and Goguen et al. (1996). We conclude that 1995 was typical for Io, in terms of overall observed variability in the volcanic sources. Detailed Comparison of data from Goguen et al. on Aug. 24 and Spencer et al. on Aug. 26 provides evidence of a high temperature eruption that produced a larger, cooler region over the course of two days. The observed frequency of occurrence of high temperature events, the linking of high and lower temperature thermal anomalies, and the observed stability of volcanic regions since Voyager suggests that high temperature silicate eruptions could support the entire observed population of cooler temperature anomalies. It may be more productive to consider sulfur flows on Io in the context of remobilization of existing sulfur deposits.

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