Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p13a1293c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P13A-1293
Physics
6265 Planetary Rings
Scientific paper
The albedos of Saturn's ring particles are not well constrained. This directly relates to the composition of the rings and has implications for their age. One way to estimate ring particle albedos is to use a numerical ray- tracing code to model the brightness of the rings and compare the results with observations. Previous models (classical doubling codes) have not accounted for a variable volume filling factor (or vertical puffiness) for the rings. Such models have not been able to correctly reproduce observed ring brightness, or I/F, profiles of the rings in all regions. This makes it difficult to determine the true albedo of the ring particles. We have developed a new radiative transfer code for modeling photon interactions with ring particles. The Beam code is based on the ray-tracing Monte Carlo technique of Salo and Karjalainen (Icarus, 2003). The code includes the volume filling factor and Saturnshine, as well as a variety of phase functions for both the rings and Saturn. Secondary effects, such as self-gravity wakes and ring-shadowing, are also included. Comparisons between Cassini observations and Beam code simulations will be presented at the meeting.
Chambers Lindsey S.
Cuzzi Jeff N.
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