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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Reconnection at the dayside magnetopause: Comparisons of global MHD simulation results with Cluster and Double Star observations
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Reconnection at the dayside magnetopause: Comparisons of global MHD simulation results with Cluster and Double Star observations

机译：重新连接的光面的磁层:全球磁流体动力仿真结果的比较集群和双星观察

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摘要

This study uses two conjunctions between Cluster and Double Star TC-1 spacecraft together with global magnetohydrodynamic (MHD) simulations to investigate the large-scale configuration of magnetic reconnection at the dayside magnetopause. Both events involve southward interplanetary magnetic fields with significant B y components. The first event occurred on 8 May 2004, while both spacecraft were exploring the dawn flank of the magnetosphere; TC-1 was skimming the magnetopause whereas Cluster was exploring higher latitudes. Results from a global MHD simulation show the formation of an equatorial merging line in the morning sector and suggest that the three-dimensional geometry of the merging region is mostly a radial juxtaposition of planes displaying X-type reconnection geometries. The second conjunction was on 6 April 2004. During this event, Cluster was located at high latitudes and close to the noon-midnight meridian, while TC-1 was exploring the dawnside at low latitudes. Analysis of the simulation reveals that both antiparallel and component merging occurred simultaneously. Three-dimensional rendering of the parallel electric field indicates that component merging initiated in the subsolar magnetopause. Simulation runs carried out using different parameters in the model suggest that the spread of the merging region depends on the local resistivity. The subsolar-merging region grows with increasing resistivity values and becomes patchy when a resistivity threshold is used. However, the region of component merging appears to remain spatially constrained to the subsolar region where stronger parallel electric fields occur and no clear connection with the antiparallel-merging regions is found for the range of parameters surveyed.
机译：本研究使用两个集群之间的连接词和双星TC-1飞船一起全球磁流体动力(磁流体动力)模拟调查的大规模配置磁重联的光面磁层。行星际磁场显著By分量。2004年,当两个航天器探索黎明磁气圈的侧面;略读磁层而集群探索高纬度地区。磁流体动力模拟显示的形成早上部门和赤道合并线建议的三维几何主要是径向合并区域并列的飞机显示交叉形重新连接几何图形。2004年4月6日。位于高纬度地区,靠近noon-midnight子午线,TC-1探索dawnside在低纬度地区。仿真表明,反平行的和组件合并同时发生。三维渲染的平行电场表明组件合并发起在现世的磁层。模拟运行时使用不同的进行模型中的参数表明,细菌传播合并地区依赖于当地电阻率。增加,电阻率值片状电阻率阈值时使用。然而,该地区的组件合并出现保持空间受限的现世的地区强电场平行发生和没有明确的联系antiparallel-merging地区发现的调查范围的参数。

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