Galileo SSI Images of Io During the I31 and I32 Flybys

Details Galileo SSI Images of Io During the I31 and I32 Flybys Galileo SSI Images of Io During the I31 and I32 Flybys

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p11a..09m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #P11A-09

Other

5462 Polar Regions, 5464 Remote Sensing, 5480 Volcanism (8450), 6218 Jovian Satellites

Scientific paper

The Galileo spacecraft completed the I31 pass of Io on August 6, 2001 and will encounter Io again on October 16 (I32) and Jan 17, 2002 (I33). All I31 images planned while Galileo was closest to Io were lost because of an electronic problem with the SSI camera related to the intense natural radiation near Jupiter, but new workarounds may result in successful imaging close to Io in I32 and I33. Distant observations of Io were successfully acquired, consisting of high-phase (134 degrees) images and two low-phase color sets. As of the abstract due date we have seen only preliminary versions (at high compression) of the high-phase images; they reveal a new bright plume near 37 N, 110-140 W, where no plume has been previously detected. The main purpose of this observation was to attempt to see the giant but faint N. Polar plume of Tvashtar, which was active (400 km high) during the joint Cassini/Galileo flyby in Dec. 2000. Galileo would have flown through this plume if it were in a similar state during I31. Low-compression versions of the I31 images may yet reveal this faint plume. The low-phase color sets of I31 will show us how the bright red plume deposit of Tvashtar may have changed. They could also reveal other surface changes, perhaps even a new plume deposit around Surt (45.5N, 338W), where an intense and high-temperature infrared brightening was observed on Feb. 22, 2001 by de Pater et al. with Keck II (IAU Circular 7588). I32 is a south polar pass with many excellent Io imaging opportunities. If the camera behaves, we'll show the first framelets at Fall AGU.

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