High-temperature hot spots on Io as seen by the Galileo solid state imaging (SSI) experiment

Details High-temperature hot spots on Io as seen by the Galileo solid state imaging (SSI) experiment High-temperature hot spots on Io as seen by the Galileo solid state imaging (SSI) experiment

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2443m&link_type=abstract

Geophysical Research Letters, vol. 24, p. 2443

Physics

40

Galileo Spacecraft, High Temperature, Imaging Techniques, Solid State, Extraterrestrial Environments, Charge Coupled Devices, Atmospheric Temperature, Infrared Spectrometers, Space Probes, Volcanoes

Scientific paper

High-temperature hot spots on Io have been imaged at approximately 50 km spatial resolution by Galileo's CCD imaging system (SSI). Images were acquired during eclipses (Io in Jupiter's shadow) via the SSI clear filter (approximately 0.4-1.0 micron), detecting emissions from both small intense hot spots and diffuse extended glows associated with Io's atmosphere and plumes. A total of 13 hot spots have been detected over approximately 70% of Io's surface. Each hot spot falls precisely on a low-albedo feature corresponding to a caldera floor and/or lava flow. The hot-spot temperatures must exceed approximately 700 K for detection by SSI. Observations at wavelengths longer than those available to SSI require that most of these hot spots actually have significantly higher temperatures (approximately 1000 K or higher) and cover small areas. The high-temperature hot spots probably mark the locations of active silicate volcanism, supporting suggestions that the eruption and near-surface movement of silicate magma drives the heat flow and volcanic activity of Io.

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