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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Tailward Flows in the Vicinity of Fast Earthward Flows
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Tailward Flows in the Vicinity of Fast Earthward Flows

机译：Tailward流附近的快速向地面流

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摘要

The occurrence of tailward flows in the magnetotail plasma sheet is closely linked to the dynamics of earthward bursty bulk flows (BBFs). Tailward flows that are observed in the vicinity of these BBFs (or TWABs - Tailward flows around BBFs) may hold unique information on its origin. In this study, we conduct a statistical survey on TWABs by using data from the Cluster mission. We find that TWABs are observed in the vicinity of ~75% of the BBFs and their occurrence does not depend on BBF velocity magnitude. TWABs have a flow convection pattern consistent with the general tailward flows (GTWs) in the plasma sheet and they do not resemble vortical-like flows. However, TWABs have a flow velocity magnitude twice larger than the GTWs. The plasma density and temperature of TWABs are comparable with BBFs. It is more common to observe a TWAB succeeding than preceding a BBF. However, there is no distinctive difference (in flow pattern, plasma density and temperature) between preceding and succeeding TWABs. We suggest that TWABs are likely the "freshly" rebounded BBFs from the near-Earth region where the magnetic field is stronger. TWABs may represent the early stage of the evolution of tailward flows in the plasma sheet. We also discuss and argue that other mechanisms such as shear-induced vortical flows and tailward slipping of depleted flux tubes cannot be the principal causes of TWABs.
机译：tailward流的发生磁尾等离子体片密切相关向地球动力学丛发性散装流(bbf)。Tailward观察附近的流动这些bbf(或TWABs Tailward流动bbf)可能拥有独特的关于其起源的信息。在这项研究中,我们进行统计调查从集群任务TWABs通过使用数据。发现TWABs观察附近的~ 75%的bbf及其不发生取决于BBF速度大小。流对流模式一致一般tailward流(GTWs)等离子体单他们不像vortical-like流动。然而,TWABs流速大小大于GTWs两倍。和温度的TWABs具有可比性bbf。比前一个BBF成功。没有独特的区别(在流型,前之间的等离子体密度和温度)TWABs和成功。可能的“新鲜”bbf反弹近地区域的磁场更强。tailward流等离子体的演化床单等机制shear-induced旋涡的流动和枯竭的通量管tailward下滑不能TWABs的主要原因。

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