Galileo PPR: First Results on Jupiter and the Galilean Satellites

Details Galileo PPR: First Results on Jupiter and the Galilean Satellites Galileo PPR: First Results on Jupiter and the Galilean Satellites

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2115t&link_type=abstract

American Astronomical Society, DPS meeting #28, #21.15; Bulletin of the American Astronomical Society, Vol. 28, p.1136

Astronomy and Astrophysics

Astronomy

Scientific paper

The first observations by the Photopolarimeter Radiometer experiment during the Jupiter orbital phase of the Galileo mission include maps of several regions on the planet and of Ganymede. Jupiter's Great Red Spot (GRS), the primary atmospheric target, was observed in photometry and polarimetry bands from 410 to 945 nm and at thermal wavelengths from 17 through 50 mu m. The thermal emission observations were used to derive temperatures between 150 mbar and the NH_3 cloud top level near 600 mbar in the troposphere. With a spatial resolution of ~ 3000 km, temperatures in the GRS were measured some 5 K colder than the periphery at the 200-mbar level, with temperature differences decreasing significantly with depth. Photometry confirms the high altitude of the GRS cloudtops, with the lower temperatures consistent with the GRS as a region of generally upwelling motions. To the northwest, zonal wave structure can be seen in the warm South Equatorial Belt. Immediately to the south of the GRS, a 3 K temperature rise at the 200-mbar level is evident. Substantial zonal wave structure is also evident in observations made over most of Jupiter's longitudes, along the warm southern boundary of the North Equatorial Belt. A 200-km resolution Ganymede thermal map covering local times from 6 to 13 hours and longitudes 140 to 260(deg) at 17 mu m reveals structure related to albedo variation in surface layers, particularly in Osiris, Uruk Sulcus, and Galileo Regio. Distant thermal observations of Europa and Io's nightside were also made.

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