Groundbased Observations of High-Temperature Volcanism on Io

Details Groundbased Observations of High-Temperature Volcanism on Io Groundbased Observations of High-Temperature Volcanism on Io

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2306v&link_type=abstract

American Astronomical Society, DPS meeting #28, #23.06; Bulletin of the American Astronomical Society, Vol. 28, p.1153

Astronomy and Astrophysics

Astronomy

Scientific paper

We have done extensive disk-integrated photometry of volcanic thermal emission from Io's Jupiter-facing hemisphere at 1.7 and 2.3 microns, using the OSIRIS infrared camera on the 72'' Perkins telescope at Lowell Observatory, to monitor volcanic activity in support of the Galileo mission. We have data from 13 nights between March and October 1995, and on 6 nights between April and July 1996. Observations were taken when Io was eclipsed by Jupiter in order to eliminate reflected sunlight. At these short wavelengths, measurements are sensitive to the hottest volcanic temperatures. Additional observations at the same wavelengths were done with the IRTF on Mauna Kea. In all 1996 observations, and through much of 1995, volcanic activity was low, Io typically being no brighter than 11th magnitude at 2.3 microns. However, a tenfold brightening was seen in late March 1995, fading in less than six weeks, and Io was also unusually bright between late July and early October 1995, as a result of eruptions at Loki and two new hot spots (Spencer et al., this volume). High 1.7:2.3 micron color temperatures were found: 1070 +/- 40 K on August 26, 1995, when Io was relatively bright, and 925 +/- 30 K on June 2, 1996, when Io was faint, strongly suggest the presence of continuous silicate volcanism on Io. The results of this work will be combined with work in progress (Spencer et al., this volume), to locate the individual hot spots and determine their temperature/area history.

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