Saturn rings thermal phase curves measured by CASSINI-CIRS: a modeling attempt (Invited)

Details Saturn rings thermal phase curves measured by CASSINI-CIRS: a modeling attempt (Invited) Saturn rings thermal phase curves measured by CASSINI-CIRS: a modeling attempt (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p54a..02a&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P54A-02

Physics

[5465] Planetary Sciences: Solid Surface Planets / Rings And Dust

Scientific paper

CASSINI-CIRS has provided spatially resolved observations of the thermal main ring emission for the past 5 years, enabling a large phase angle coverage for different solar elevations. A thermal opposition effect was reported in optically thick ring regions, where the phase curve shape also shows a clear dependency with the solar elevation. Temperature variations with phase are primarily linked to the angle between the plane of solar illumination incidence and the plane of emergence of the observed thermal radiation and are most likely explained by the varying fraction of shadowed material within the instrument field-of-view, either because of interparticle shadowing or because of shadows created by material roughness on the surface of individual particles. A separation of the relative shadowing contributions is important because each shadowing process reveals either ring collective properties (interparticle shadowing is a function the particle size distribution, of the mean particle spacing and of the ring volume filling factor) or individual particle properties (surface roughness). We present a comparison of the data with theoretical thermal phase curves using both numerical and analytical shadowing functions computed for different particle distributions at various solar elevation.

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