Dielectric Properties of Titan's Surface using the Cassini RADAR Radiometer

Details Dielectric Properties of Titan's Surface using the Cassini RADAR Radiometer Dielectric Properties of Titan's Surface using the Cassini RADAR Radiometer

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.5606j&link_type=abstract

American Astronomical Society, DPS meeting #38, #56.06; Bulletin of the American Astronomical Society, Vol. 38, p.586

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The Cassini Radar instrument includes a passive microwave radiometer that operates at 13.78 GHz ( 2.2 cm wavelength). The radiometer has been used to image the calibrated thermal emission from a significant portion of Titan's surface, at resolutions ranging from 5 - 500 km and at a variety of emission angles and polarizations. Interpretation in terms of surface dielectric models yields the following conclusions: 1) Globally, the effective dielectric constant of the surface is 2 or less, inconsistent with a solid ice surface, 2) Retrieved dielectric constants approaching unity over large regions in Xanadu and elsewhere indicate the presence of extensive and extreme surface roughness on wavelength scales, and 3) The generally low measured brightness temperatures relative to the physical temperature of the surface ( 80 K as opposed to 94 K) indicate that subsurface (volume) scattering is present at some level almost everywhere. Implications for the surface of Titan will be discussed. This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

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