Cassini Radio Occultation Results for Saturn's Rings

Details Cassini Radio Occultation Results for Saturn's Rings Cassini Radio Occultation Results for Saturn's Rings

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p31d..04m&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P31D-04

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Scientific paper

The Cassini spacecraft completed a set of eight radio occultation observations of Saturn's rings during the period May 2 to September 5, 2005. The observation geometry was optimized to provide multiple ring longitude measurements at three radio wavelengths (0.94, 3.6, 13 cm; Ka-, X-, and S-band, respectively). A normal optical depth profile, a phase shift profile, as well as spectrogram of the near-forward scattered signal are constructed at each observation longitude and wavelength. High spatial resolution X-band optical depth profiles (up to 400 m so far) reveal for the first time detailed structure of Ring B, Saturn's most massive ring feature, as well as structure of many dynamical ring features including density and bending waves driven by exterior satellites, wakes due to embedded satellites, ring gaps, narrow eccentric gap-embedded ringlets, sharp ring edges, among others. Remarkable variability of ring structure with longitude is observed, including prominent asymmetry in Ring A. The Ka/X/S optical depth observations are used to characterize variability in the abundance of particle sizes that populate observed structure over the millimeters to centimeters radius range. Combined, the Ka/X/S optical depth and spectrograms of the near-forward scattered signal provide complementary information about the abundance of the meters size particles and their spatial distribution, including potential crowding, clustering, and preferred orientations.

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