Density and Bending Waves in Saturn's Rings from Cassini UVIS Star Occultations

Details Density and Bending Waves in Saturn's Rings from Cassini UVIS Star Occultations Density and Bending Waves in Saturn's Rings from Cassini UVIS Star Occultations

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2606c&link_type=abstract

American Astronomical Society, DPS meeting #39, #26.06; Bulletin of the American Astronomical Society, Vol. 39, p.461

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Scientific paper

In the first three years of its orbital tour at Saturn, Cassini observed 62 stellar occultations with the High Speed Photometer channel of the Ultraviolet Imaging Spectrograph (UVIS). Radial coverage was not complete for many occultations, while others sampled the same ring plane radius at two longitudes. Sampling rates and diffraction give a radial resolution of 10 m in some occultations. The large number of occultations and high spatial resolution allow us to explore both fine-scale and large-scale structure in the radial and azimuthal dimensions. Here we present preliminary results on the satellite density and bending waves seen in UVIS occultation data. The linear density wave theory of Shu et al. (1985) reproduces the phases, though not the amplitudes, of the first-order density waves we have analyzed so far. The dispersion of these waves provides a measure of the local surface mass density. We find evidence for variations in the background surface mass density within individual wavetrains. We present a summary of density wave measurements and surface mass densities from this initial set of occultations observed by UVIS. This research is supported by the Cassini Project through NASA/JPL.

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