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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Size, shape, and orientation of magnetosheath mirror mode structures
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Size, shape, and orientation of magnetosheath mirror mode structures

机译：磁鞘的大小、形状和方向镜像模式结构

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Information about the size, shape, and orientation of mirror mode structures in the magnetosheath is obtained by combining data from the four Cluster spacecraft, resulting in an estimate of the form of the magnetic field magnitude spatial autocorrelation function. Itis shown that the longest direction of the structures is typically inclined at around 30° from the local magnetic field direction, consistent with predictions based on linear growth theory; their smallest size is also consistent with these predictions. The ratio of the longest to shortest scales of the structures is typically 2-6, with some evidence for this value to decrease as the structures are carried downstream. This suggests that the mirror modes are generated as long structures, but gradually become isotropic, possibly as part of their nonlinear growth. In common with earlier work, we find that the direction in which the structures are shortest is typically well aligned with the local magnetopause normal, consistent with compression against this boundary. However, the maximum variance direction is not a good proxy for the long axis of the structures, typically lying around 25° from it.
机译：信息的大小、形状和方向镜像模式结构磁鞘中通过结合数据四个集群宇宙飞船,导致估计的形式的磁场大小的空间自相关函数。结构通常是最长的方向倾向于从当地磁场在30°左右磁场方向,与预测一致基于线性增长理论;大小也与这些预测一致。的比例最长最短的尺度结构通常是2 - 6,一些这个值减少的证据结构进行下游。只要生成镜像模式结构,但逐渐成为各向同性,可能是非线性增长的一部分。与早期的研究,我们发现结构是最短的方向通常与当地的良好结合磁层正常,符合压缩在这样的边界。不是一个好代理的变化方向长轴的结构,通常是在撒谎大约25°。

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