Physics
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..911m&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 911.
Physics
Io, Plumes, Satellite Observation, Galileo Spacecraft, Hubble Space Telescope, Satellite Imagery, Volcanoes, Voyager Project
Scientific paper
Observations by the Galileo Solid State Imaging (SSI) experiment and by the HST have both yielded surprises with respect to airborne volcanic plumes on Io. As of late 1996 SSI has detected far fewer bright visible plumes than were seen by Voyager in 1979. Although the SSI data return is strongly limited by tape and downlink resources, we are now confident that the general paucity of bright plumes is real. There are many high-temperature hot spots on Io during late 1996, so the general level of volcanic activity remains high. Johnson et al. (1995) proposed the existence of 'stealth' plumes on Io, high-entropy eruptions of gas with few entrained particulates, transparent at visible wavelengths. A July 1996 observation by HST shows that Pele had a plume about 400 km high that could be detected at 255 nm, but not at 340 or 410 nm, consistent with an SO2 gas absorption or the presence of very fine particles. Pele's plume was 300 km high during Voyager 1, so this is the largest plume yet detected on Io. We now confirm that the Pele plume is often and perhaps continuously active, and may be a 'near-stealth' plume.
Belton Michael
Galileo SSI Team
Johnson Teresa
Keszthelyi Laszlo
McEwen Alfred
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