Temperature and Variability of Three Ionian Volcanoes

Details Temperature and Variability of Three Ionian Volcanoes Temperature and Variability of Three Ionian Volcanoes

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6602a&link_type=abstract

American Astronomical Society, DPS meeting #41, #66.02

Astronomy and Astrophysics

Astronomy

Scientific paper

The Cassini spacecraft imaged the surface of Io in eclipse by Jupiter in late 2000 and early 2001 and obtained multiple-filter images over timescales of hours. Images like these have been used to study the
temperature and variability of the numerous hotspots on the surface of this volcanically active moon. For example, using a basic color temperature analysis, Pele was found to be an active lava lake with most likely basaltic lava composition. Data from the New Horizons spacecraft suggest temperatures in the basaltic range with values of 1150 K to 1335 K for the brightest hotspots like Pele. We undertook similar color temperature analyses to determine the lava composition and eruption style of three additional hotspots, Pillan, Wayland and Loki, using the Cassini data. We found mean color temperatures ± of 1200±240 K, 1320±130 K, and 1260±320 K for Pillan, Wayland, and Loki, respectively. These temperatures are suggestive of basaltic lava, but the maximum color temperatures recorded were consistent with ultramafic lava. Low signal strength, particularly in the infrared bandwidths, led to high error bars making the composition inconclusive. The data for Pillan showed
an overall decrease in clear filter intensity over the three eclipse observations, with data obtained over intervals of tens of minutes and tens of hours, and were consistent with a cooling lava flow. Wayland's intensity decreased over the three eclipses as well indicating a cooling lava flow overall. However, it also showed a decrease of 257 electrons/s over a period of 48 minutes suggesting the end of an eruption of highly exposed lava, perhaps an open channel or fountain. Intensities at Loki over the
course of the observation varied in both directions, and were consistent with previous determinations of a lava lake with periods of active overturning and fountains.

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