New Wave Signatures Inside Saturn's C-ring

Details New Wave Signatures Inside Saturn's C-ring New Wave Signatures Inside Saturn's C-ring

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.2507b&link_type=abstract

American Astronomical Society, DPS meeting #41, #25.07

Astronomy and Astrophysics

Astronomy

Scientific paper

We performed a complete wavelet analysis of Saturn's C ring on 103 stellar occultation profiles provided by Cassini Ultra-Violet Imaging Spectrograph instrument using a WWZ power transform.
Using a co-adding process, we found evidence of 10 waves reported by Rosen et al., 1991, Icarus 93, 3-44, 12 reported by Colwell et al., 2009, in Saturn after Cassini-Huygens (including the Atlas 2:1 Density Wave at 87648 km), together with 24 previously unreported wavelike features, 8 of which appear to be propagating waves, including a 60 km wide one in a plateau at 86395 km.
We also report similarities between the 1.470 RS ringlet and the Huygens Ringlet in the Cassini Division: a power wavelength signature is visible around 1km in a diversity of occultation profiles together with similar ringlet widths.
We produced a complete map of resonances with external satellites, F-ring core and possible structures rotating with Saturn's rotation period up to an order five, allowing us to identify some previous waves as the Pan 2:1 IVR and Daphnis 2:1 IVR and some new detected ones like the Pan 4:2 ILR, Pandora 4:2 ILR.
We derived the surface mass density, σ/m-1 from individual occultation profiles: we report σ = 0.14 g.cm-2 and an opacity of 0.36 cm2g-1 for the Atlas 2:1 ILR, σ = 0.80 g.cm-2 and an opacity of 0.35 cm2g-1 for the Pandora 4:2 ILR, and σ/m-1 = 1.6 g.cm-2 in the widest wave at 86395 km.
We will present the results of our analysis of these new waves in the C ring and discuss implications for the C ring mass and particle size distribution.

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