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Spoke formation under moving plasma clouds

Farmer, Alison J. and Goldreich, Peter (2005) Spoke formation under moving plasma clouds. Icarus, 179 (2). pp. 535-538. ISSN 0019-1035.

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Goertz and Morfill [Goertz, C.K., Morfill, G., 1988. Icarus 53, 219–229] propose that spokes on Saturn's rings form under radially moving plasma clouds produced by meteoroid impacts. We demonstrate that the speed at which a plasma cloud can move relative to the ring material is bounded from above by the difference between the Keplerian and corotation velocities. The radial orientation of new spokes requires radial speeds that are at least an order of magnitude larger than this upper limit, thus the model advanced by Goertz and Morfill fails to make radial spokes.

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Additional Information:© 2005 Elsevier Inc. Available online 19 September 2005. This research was supported by NSF grant AST 00-98301. We thank J.H. Waite for information on Saturn’s ionospheric conductivity.
Funding AgencyGrant Number
NSFAST 00-98301
Subject Keywords:Planetary rings, Saturn; Saturn, magnetosphere
Issue or Number:2
Record Number:CaltechAUTHORS:20130225-090018853
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Official Citation:Alison J. Farmer, Peter Goldreich, Spoke formation under moving plasma clouds, Icarus, Volume 179, Issue 2, 15 December 2005, Pages 535-538, ISSN 0019-1035, 10.1016/j.icarus.2005.07.025.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37103
Deposited By: Tony Diaz
Deposited On:25 Feb 2013 21:20
Last Modified:03 Oct 2019 04:44

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