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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Numerical MHD modeling of propagation of interplanetary shock through the magnetosheath
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Numerical MHD modeling of propagation of interplanetary shock through the magnetosheath

机译：传播的数值磁流体动力建模行星际激波通过磁鞘

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摘要

Propagation of an interplanetary (IP) shock through the bow shock and magnetosheath is studied using numerical results of a three-dimensional MHD model of the magnetosheath. According to already published theoretical studies, a fast forward shock passing through the bow shock would generate a train of new discontinuities including a slow expansion wave, a contact discontinuity, and a slow reversed shock. We have found that these particular discontinuities propagate with similar velocities and thus they cannot be distinguished in our calculations, and we observe one discontinuity that combines properties of all of them. We suggest that the same would be true for an analysis of experimental data. We have simulated three different ways of the magnetopause response to the IP shock. A comparison of these runs reveals that the magnetopause reaction defines the mode of reflected waves. Assuming a fast earthward motion of the magnetopause, about 240 km s?1 or more, we obtain that a fast rarefaction wave would propagate from the magnetopause toward the bow shock, while a slower magnetopause motion would result in a fast reversed shock. On the other hand, the speed of the IP shock propagation does not depend on the magnetopause response, and all three model runs confirm a deceleration of the modeled IP shock front in the magnetosheath in course of its motion from the subsolar region to the magnetosheath flanks.
机译：传播的星际(IP)冲击通过弓形激波和磁鞘研究使用的数值结果三维磁鞘的磁流体动力模型。根据已经发表的理论经过研究,快速向前冲击弓形激波会生成一个新的训练不连续包括缓慢扩张浪潮,接触不连续,缓慢的逆转冲击。不连续和类似的速度传播在我们的生活中,因此他们不能区分计算,我们观察一个不连续结合所有人的属性。建议的亦是如此实验数据的分析。三种不同方式的磁响应IP的冲击。揭示了磁层反应定义反射波的模式。向地球磁层的运动,约240人公里的年代吗?从磁层向波浪传播弓形激波,而较慢的磁层运动会导致一个快速扭转冲击。另一方面,IP冲击的速度传播不依赖于磁响应和这三个模型运行确认的减速磁鞘建模IP激震前沿在课程的运动来自热带的地区磁鞘侧翼。

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