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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A simulation study of Kelvin-Helmholtz waves at Saturn's magnetopause
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A simulation study of Kelvin-Helmholtz waves at Saturn's magnetopause

机译：Kelvin-Helmholtz波的模拟研究土星磁层

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摘要

In global simulations vortices form along Saturn's dawnside magnetopause when there is high-velocity shear and the condition for the generation of Kelvin-Helmholtz (K-H) waves is met. The wave vectors (k) are related to the thickness of the magnetopause layer (d) by kd ～ 1. K-H waves form on both the magnetopause and the inner edge of the boundary layer. In the simulation waves are similar to those found in simulations of the Earth's magnetosphere. The main difference is that at Saturn rotating flows are important for making the boundary unstable. The waves form for northward interplanetary magnetic field (IMF) and not for southward IMF. (Note that Saturn's magnetic field is opposite to that at Earth so northward IMF can lead to reconnection at the dayside magnetopause.) For northward IMF the effect of reconnection is to enhance the electric field on the dawnside so that rotating flows within the magnetosphere are enhanced. This leads to instability. About 20 h after a northward IMF first interacts with the dayside magnetopause, reconnection occurs in the tail. Flows from the tail to the dayside reduce the plasma density in the dayside magnetosphere, causing the boundary to become stable. Within the magnetosphere the K-H waves lead to oscillations in the magnetic field. Similar oscillations are found in Cassini observations. K-H waves also can form at the afternoon magnetopause for northward IMF. They form later and tend to have smaller amplitude than those found in the morning.
机译：在全球模拟涡流在土星的形式当有高速dawnside磁层剪切的生成和条件Kelvin-Helmholtz (k - h)波。向量(k)的厚度相关磁层(d) kd ~ 1。磁层和内部的边缘边界层。在模拟类似发现地球的磁气圈。在土星旋转流动是很重要的使不稳定的边界。向北行星际磁场(IMF)国际货币基金组织(IMF)向南。地球磁场相反北方国际货币基金组织(IMF)会导致重新连接的的光面磁层)。重新连接的效果是提高电dawnside这样旋转流场在磁层增强。不稳定。第一次与侧磁层,重新连接发生在尾巴。尾巴的光面降低等离子体密度昼磁层,导致边界变得稳定。k - h波导致磁振荡字段。观察。下午磁北国际货币基金组织(IMF)。形成后,往往有更小的振幅比早上发现。

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