Manifestation Of Coherent Backscattering In Spectra Of Icy Satellites Of Saturn.

Details Manifestation Of Coherent Backscattering In Spectra Of Icy Satellites Of Saturn. Manifestation Of Coherent Backscattering In Spectra Of Icy Satellites Of Saturn.

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.0304k&link_type=abstract

American Astronomical Society, DPS meeting #41, #3.04

Physics

Scientific paper

The "coherent backscattering effect” (CBE) manifests itself by a narrow spike of brightness and a deep negative feature of polarization observed at small phase angles. The effect results from constructive interference of waves that experienced multiple scattering in the medium and had the same path but traversed in opposite directions. Since CBE depends on the efficiency of multiple scattering, it is sensitive to the size and packing of scattering particles and to the optical constants of their material. Theoretical and laboratory modeling of CBE has shown that the effect is especially pronounced for bright transparent particles and disappears for dark absorptive particles. Thus, the steepness of the phase function of brightness should be different within and outside of absorption bands, resulting in different depths of the absorption bands at different phase angles.
A substantial CBE was detected by Buratti et al (LPSC 40, 2009) in Cassini VIMS data for icy satellites of Saturn. In accordance with the physics of CBE, the steepness of the photometric spike was found to be less pronounced within the absorption bands of ice than outside them, and the depth of the absorption bands was noticeably different at different phase angles.
Using a recent theoretical model of CBE by Tishkovets and Mishchenko (JQSRT 110, 2009) we modeled the spectra of light scattered by loosely packed icy particles and found a change in the absorption bands similar to that observed for icy satellites of Saturn. We found that the phase angle change in spectra strongly depends on size and packing of the particles and the modeling allowed us to place constraints on them. Thus, studies of spectral manifestations of CBE not only improve our understanding of the formation of absorption bands but can be used as a new remote-sensing technique for characterization of surfaces and dust particles.

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