Detection of Wavelike Structures in Saturn's Cassini Division

Details Detection of Wavelike Structures in Saturn's Cassini Division Detection of Wavelike Structures in Saturn's Cassini Division

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1807h&link_type=abstract

American Astronomical Society, DPS meeting #28, #18.07; Bulletin of the American Astronomical Society, Vol. 28, p.1125

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Scientific paper

Several features with wavelike characteristics were detected in the Voyager Radio Science (RSS) earth occultation data of Saturn's Cassini Division. We identified these structures using a non-linear autoregressive power spectral algorithm called Burg. This method is powerful for detecting short sections of quasiperiodic structure. We successfully used this same technique to identify six previously unseen Pan wakes in the Voyager photopolarimeter (PPS) stellar occultation data and the Voyager RSS occultation data (Horn, Showalter and Russell, Icarus, in press). When we apply the Burg technique to the RSS data we find many wavelike structures in the Cassini Division. We see three distinct features that look like moonlet wakes. Two are Cassini Division features detected by Marouf and Tyler (1986, Nature 323, 120) in the Voyager RSS data. Flynn and Cuzzi (1989, Icarus 82, 180) determined that these features were azimuthally symmetric in the Voyager images and were most likely not satellite wakes. The third wavelike structure resembles an outer satellite wake. If it is a wake, it corresponds to a previously undetected moonlet 84 degrees away which resides in a Cassini Division gap located between 118,929 km and 118,966 km. Several other wavelike structures in the Cassini Division are reminiscent of satellite wakes. We plan to pursue these structures further in the future. We will also look at the Voyager PPS data as well although this data set is somewhat noisier in the Cassini Division. This work was performed at JPL under contract with NASA.

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