Mathematics – Logic
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3406h&link_type=abstract
American Astronomical Society, DPS meeting #40, #34.06; Bulletin of the American Astronomical Society, Vol. 40, p.457
Mathematics
Logic
Scientific paper
During the primary mission Cassini's Synthetic Aperture Radar (SAR) has covered 25% of Titan's surface at a resolution of 0.3 km/pixel. Absolutely calibrated brightness temperatures, obtained coincident with SAR observations, are reported at 4.5 km/pixel. The Visual and Infrared Mapping Spectrometer (VIMS) observes Titan globally at a scale of 25-400 km/pixel, but also acquires small subsets of hyperspectral cubes at resolutions up to .5 km/pixel. In this work we present a joint analysis of surface features found within both the high resolution VIMS cubes and RADAR SAR/Radiometry datasets.
VIMs observes surface features through infrared methane windows and is dominated by topography as well as the composition and grain size of the surface to a depth of a few tens of microns. SAR observations use a 2.17 cm wavelength to probe surface features through the atmosphere. The reported backscatter is dominated by slope, roughness, and surface composition at decimeter to meter scale depths. While the physical temperature of Titan's surface is relatively well known, Cassini's Radiometer provides information on surface emissivity, which is generally anti-correlated to SAR backscatter. SAR backscatter, Radiometry, and VIMS reflectance provide complementary information regarding the nature of observed surface features.
Six regions of coincident RADAR and VIMS observations, including a proposed cryovolcano near (145W,9N), are described and analyzed. Many surface units, especially dune fields and radar bright areas inferred to be elevated terrain show excellent correlation between RADAR and VIMS. Other radar bright surfaces units show little to no correlation with VIMS data. Jointly analyzing these areas allows previously published hypotheses to be tested and updated. In addition, many of the features found within the studied regions are common throughout the global SAR dataset and provide type-examples for geologic units found on Titan.
Aharonson Oded
Cassini RADAR Team
Hayes Alexander
Janssen Martin
Le Gall A. A.
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