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SUMMARY:Propeller Structure Induced in Saturn's Rings by Embedded Moonlets
  - Juergen Schmidt (Postdam)
DTSTART:20081110T160000Z
DTEND:20081110T170000Z
UID:TALK12986@talks.cam.ac.uk
CONTACT:Dr Geoffroy Lesur
DESCRIPTION:The size distribution of Saturn's ring particles is constraine
 d by Voyager and Cassini data to roughly follow a (differential) power law
  with exponent near -2.75 to -3 ranging between 10cm to about 10m. A popul
 ation of larger particles\, following a much steeper distribution\, was pr
 edicted by Cuzzi et al\, (1984\, Planetary Rings\, Arizona Press). The res
 ponse of \nthe ring on the gravitational perturbation of such a 100m to km
  sized boulder\, showing a characteristic propeller shaped signature\, was
  calculated by Spahn and Sremcevic\, AA 358\, 2000\, 368\, including the e
 ffect \nof ring viscosity. Such propellers\, indicative of moolets embedde
 d in the rings\, were discovered in Cassini images of Saturn's A ring. Int
 erestingly \nthey appear concentrated in a relatively narrow radial region
 . In this talk I review theoretical aspects of the propellers\, the Cassin
 i data\, and possible interpretations.
LOCATION:MR14\, DAMTP\, Pav. F
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