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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Statistical study of the alteration of the magnetic structure of magnetic clouds in the Earth’s magnetosheath
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Statistical study of the alteration of the magnetic structure of magnetic clouds in the Earth’s magnetosheath

机译：统计研究的变更磁结构的磁云地球的磁鞘

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摘要

The magnetosheath plays a central role in the solar wind-magnetospheric coupling. Yet the effects of its crossing on solar wind structures such as magnetic clouds (MCs) are generally overlooked when assessing their geoeffectivity. Using 82 MCs observed simultaneously in the solar wind and the magnetosheath, we carry out the first statistical study of the alteration of their magnetic structure in the magnetosheath. For each event, the bow shock properties are obtained from a magnetosheath model. The comparison between the model results and observations shows that in 80% of cases, the MHD-based model captures well the magnetosheath transition; the other events are discussed separately. We find that just downstream of the bow shock the variation of the magnetic field direction shows a very good anticorrelation (r = ?0.91) with the angle between the upstream magnetic field and the shock normal. We then focus on the magnetic field north-south component B_z because of its importance for geoeffectivity. Although the sign of B_z is generally preserved in the magnetosheath, we also find evidence of long-lasting intervals of opposite B_z signs in the solar wind and the magnetosheath during some events, with a |B_z| reversal >10 nT at the magnetopause. We find that these reversals are due to the draping of the field lines and are associated with predominant upstream B_y. In those cases, the estimated position of the regions of antiparallel fields along the magnetopause is independent of the sign of the upstream B_z. This may have strong implications in terms of reconnection.
机译：的磁鞘中起着重要的作用太阳能wind-magnetospheric耦合。太阳风的交叉结构的影响如磁云(MCs)一般当评估他们geoeffectivity被忽视。在太阳能使用MCs 82同时观察到风和磁鞘,我们执行第一次变更的统计研究磁鞘的磁结构。对于每个事件,弓形激波特性从磁鞘获得模型。对比结果和模型观察结果显示,在80%的情况下,MHD-based模型捕获磁鞘过渡;分开。弓形激波的变化磁场显示了很好的anticorrelation (r =方向与上游的夹角0.91 ?)磁场和冲击正常。专注于磁场南北组件geoeffectivity说是因为它的重要性。虽然说是通常保存的迹象磁鞘中,我们也发现的证据持久的间隔说是相反的迹象在一些太阳风、磁鞘事件,|说是|逆转> 10元磁层。由于电场线的隔音材料和与主要上游的话。这种情况下,估计的位置地区的反平行的字段磁层独立的标志上游说是。重新连接。

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