Spoke Formation Under Moving Plasma Clouds
نویسندگان
چکیده
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 faster. The model advanced by Goertz and Morfill fails this test. Subject headings: Planetary rings, Saturn — Saturn, magnetosphere
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