Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p23b1372s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P23B-1372
Physics
5418 Heat Flow, 5422 Ices, 5475 Tectonics (8149), 5480 Volcanism (6063, 8148, 8450), 6280 Saturnian Satellites
Scientific paper
Cassini's four close flybys of Enceladus in 2008 are providing unprecedented views of the active "tiger stripe" fractures in the moon's south polar region. The Composite Infrared Spectrometer (CIRS) instrument is obtaining spectral maps of the endogenic thermal emission from the tiger stripes at wavelengths from 7 to 1000 microns. Here we concentrate on observations of the short-wavelength radiation made with CIRS's high spatial resolution focal planes "FP3" (9 -- 16 microns) and "FP4" (7 -- 9 microns). FP3 and FP4 observations during the March 12 2008 flyby mapped most of the active region at a spatial resolution of 4 -- 10 km, revealing large variations in emission along and between the tiger stripes. FP4 data revealed temperatures in excess of 180 K along the brightest parts of the tiger stripe fracture named Damascus Sulcus. The August 11th flyby provided some scattered observations with spatial resolution as high as 400 meters, a very high signal-to-noise spectrum of 7 -- 9 micron emission from Damascus Sulcus with 1.5 x 3.0 km resolution, and high-resolution mapping of emission along parts of Baghdad Sulcus. Lower spatial resolution observations helped to complete the mapping of the entire active south polar region, and provided constraints on the time variability of the emission on month-to-year timescales. Additional high- resolution observations are planned during the two upcoming flybys on October 9 and October 31 2008.
Cassini Team
Howett C. J.
Pearl John C.
Segura Marcia E.
Spencer John Robert
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