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A dawn-dusk density asymmetry in Earth's magnetosheath

机译:地球磁石破晓的黎明黄昏密度不对称

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Magnetosheath data from IMP 8 and solar wind data from ISEE 1, ISEE 3, and WIND are used to investigate Earth's magnetosheath structure. Magnetosheath data are transformed into a coordinate system which allows data from regions with similar physical histories to be binned together. The results show a significant dawn-dusk asymmetry in Earth's magnetosheath near solar maximum but not near solar minimum, with larger densities on the dawnside than on the duskside. We use a magnetohydrodynamic (MHD) simulation to model the Parker spiral interplanetary magnetic field (IMF) case; an asymmetry does develop in the same sense as observed in the data but with a somewhat smaller magnitude. Near solar minimum the observed density asymmetry is dependent on the IMF orientation, but this is not true near solar maximum, apparently ruling out both foreshock effects and different compressions/deflections by parallel and perpendicular shocks as causes. Earth's magnetosphere thus could be a contributor to this effect. [References: 29]
机译:来自IMP 8的磁层数据和来自ISEE 1,ISEE 3和WIND的太阳风数据用于研究地球的磁层结构。磁石场数据被转换成一个坐标系,该坐标系允许将具有相似物理历史记录的区域中的数据合并在一起。结果表明,在接近太阳最大值但不接近太阳最小值的情况下,地球磁层的明显的黎明黄昏不对称性,黎明时的密度大于黄昏时的密度。我们使用磁流体动力学(MHD)模拟来模拟Parker螺旋行星际磁场(IMF)情况;不对称性的确与数据中观察到的相同,但是幅度较小。接近太阳极小值时,观察到的密度不对称性取决于IMF方向,但这在太阳最大极值附近不是正确的,显然排除了前震效应和由平行和垂直震动引起的不同压缩/挠度。因此,地球的磁层可能是造成这种效应的原因。 [参考:29]

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