Titan's surface from combined SAR and radiometry using the Cassini RADAR

Details Titan's surface from combined SAR and radiometry using the Cassini RADAR Titan's surface from combined SAR and radiometry using the Cassini RADAR

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p44a..04p&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P44A-04

Mathematics

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6281 Titan

Scientific paper

The Cassini Titan Radar Mapper has proven to be valuable for the investigations of Titan's surface. Titan's Synthetic Aperture RADAR (SAR) and radiometry of four flybys (Ta: October 2004; T3: February 2005; T7: September 2005; T8: October 2005) are reviewed in this paper with emphasis on the correlation and comparison of surface features and physical characteristics. The radiometry data used are acquired during the SAR active mode using the 5 antenna beams at 13.78 GHz (=2.17 cm). The observations are then modeled to derive brightness temperature measurements and form surface maps covering the same areal extent of the SAR swath to allow comparison of radiometry and SAR surface features. The response of surface features to SAR and radiometry in the Ta and T3 fly-bys has demonstrated the value of characterizing their physical properties and surface characterisctics. We examine the most recent data sets from T7 and T8 fly-bys in this context. In Ta and T3 the correlation between SAR-bright and radiometric cold regions, SAR-dark and radiometric warm regions has been observed extensively in association with diverse geological features, which suggests that the correlation is not caused by a specific geologic process but characterizes the constituent material and surface properties of the features. The correlation between SAR and radiometry is limited by the radiometry footprint resolution at closest approach, which imposes a limit to the detection and correlation of surface features smaller than 6 km azimuth resolution. Further there is a large-scale variability in calibration among the five radiometer beams caused by sidelobes that must be accounted for to obtain relative brightness variations. However, a general comparison of surface characteristics among swaths is possible.

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