Local Time Dependence of Saturn's Rings Thermal Emission with CIRS/Cassini and Thermal Modeling

Details Local Time Dependence of Saturn's Rings Thermal Emission with CIRS/Cassini and Thermal Modeling Local Time Dependence of Saturn's Rings Thermal Emission with CIRS/Cassini and Thermal Modeling

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2605l&link_type=abstract

American Astronomical Society, DPS meeting #39, #26.05; Bulletin of the American Astronomical Society, Vol. 39, p.461

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Scientific paper

One of the most striking characteristics of Saturn is surely its dense system of rings. Understanding the physical and thermal processes which govern the dynamical evolution of Saturn's rings is one of the main goal of the Cassini mission. After 3 years of observations, the Cassini Composite Infrared Spectrometer (CIRS) on board the spacecraft has obtained a large number of thermal infrared spectra of Saturn's rings.
The ring temperature and filling factor appear to depend strongly on on the geometry of observations, determined by the solar phase angle, and the solar and spacecraft elevations. They are also linked to thermal properties of ring particles and also to their vertical and spatial arrangement.
We present an overview of the A, B and C main rings which reveal different thermal azimuthal and radial behaviors.
We also derive morphological parameters of self gravity wakes in the A and B rings from azimuthal variations of the filling factor, by using two different "bar models" with wakes represented either by regularly spaced bars with infinite optical depth or finite optical depth. We also present a new thermal bar model to explain azimuthal variations of temperatures in the A ring and compare results with previous models of spherical particles. The Cassini/CIRS azimuthal scans data set is therefore a crucial input for any future modeling of Saturn's rings' thermal and dynamical properties.

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