Titan's surface from Cassini RADAR SAR and high resolution radiometry data of the first five flybys

The first five Titan flybys with Cassini's Synthetic Aperture RADAR (SAR) and radiometer are examined with emphasis on the calibration and interpretation of the high-resolution radiometry data acquired during the SAR mode (SAR-radiometry). Maps of the 2-cm wavelength brightness temperature are...

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Veröffentlicht in:Icarus (New York, N.Y. 1962) N.Y. 1962), 2007-11, Vol.191 (1), p.211-222
Hauptverfasser: Paganelli, F., Janssen, M.A., Stiles, B., West, R., Lorenz, R.D., Lunine, J.I., Wall, S.D., Callahan, P., Lopes, R.M., Stofan, E., Kirk, R.L., Johnson, W.T.K., Roth, L., Elachi, C., the Radar Team
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container_issue 1
container_start_page 211
container_title Icarus (New York, N.Y. 1962)
container_volume 191
creator Paganelli, F.
Janssen, M.A.
Stiles, B.
West, R.
Lorenz, R.D.
Lunine, J.I.
Wall, S.D.
Callahan, P.
Lopes, R.M.
Stofan, E.
Kirk, R.L.
Johnson, W.T.K.
Roth, L.
Elachi, C.
the Radar Team
description The first five Titan flybys with Cassini's Synthetic Aperture RADAR (SAR) and radiometer are examined with emphasis on the calibration and interpretation of the high-resolution radiometry data acquired during the SAR mode (SAR-radiometry). Maps of the 2-cm wavelength brightness temperature are obtained coincident with the SAR swath imaging, with spatial resolution approaching 6 km. A preliminary calibration shows that brightness temperature in these maps varies from 64 to 89 K. Surface features and physical properties derived from the SAR-radiometry maps and SAR imaging are strongly correlated; in general, we find that surface features with high radar reflectivity are associated with radiometrically cold regions, while surface features with low radar reflectivity correlate with radiometrically warm regions. We examined scatterplots of the normalized radar cross-section σ 0 versus brightness temperature, finding differing signatures that characterize various terrains and surface features. Implications for the physical and compositional properties of these features are discussed. The results indicate that volume scattering is important in many areas of Titan's surface, particularly Xanadu, while other areas exhibit complex brightness temperature variations consistent with variable slopes or surface material and compositional properties.
doi_str_mv 10.1016/j.icarus.2007.04.032
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source Elsevier ScienceDirect Journals
subjects Astronomy
Earth, ocean, space
Exact sciences and technology
Radar observations
Satellites
Saturn
Solar system
surfaces
Titan
title Titan's surface from Cassini RADAR SAR and high resolution radiometry data of the first five flybys
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