Spoke formation under moving plasma clouds

Details Spoke formation under moving plasma clouds Spoke formation under moving plasma clouds

2005-09-12

arxiv.org/abs/astro-ph/0509306v1

Astronomy and Astrophysics

Astrophysics

15 pages, 2 figures, Icarus in press

Scientific paper

10.1016/j.icarus.2005.07.025

Goertz and Morfill (1983) 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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