标题： 等离子云移动下沉子结构的形成 显示英文标题

标题： Spoke formation under moving plasma clouds

摘要： 戈尔茨和莫莫菲尔（1983）提出，土星环上的辐条是在由流星体撞击产生的径向移动的等离子云作用下形成的。 我们证明了等离子云相对于环物质可以移动的速度上限是由开普勒速度与共旋转速度之差决定的。 新辐条的径向排列需要的速度至少比这个上限大一个数量级，因此戈尔茨和莫莫菲尔提出的模型无法形成径向辐条。 显示英文摘要

摘要： 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.