Ergun R E, Goodrich K A, Wilder F D, Holmes J C, Stawarz J E, Eriksson S, Sturner A P, Malaspina D M, Usanova M E, Torbert R B, Lindqvist P-A, Khotyaintsev Y, Burch J L, Strangeway R J, Russell C T, Pollock C J, Giles B L, Hesse M, Chen L J, Lapenta G, Goldman M V, Newman D L, Schwartz S J, Eastwood J P, Phan T D, Mozer F S, Drake J, Shay M A, Cassak P A, Nakamura R, Marklund G
Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, Colorado 80303, USA.
Laboratory of Atmospheric and Space Sciences, University of Colorado, Boulder, Colorado 80303, USA.
Phys Rev Lett. 2016 Jun 10;116(23):235102. doi: 10.1103/PhysRevLett.116.235102.
We report observations from the Magnetospheric Multiscale satellites of parallel electric fields (E_{∥}) associated with magnetic reconnection in the subsolar region of the Earth's magnetopause. E_{∥} events near the electron diffusion region have amplitudes on the order of 100 mV/m, which are significantly larger than those predicted for an antiparallel reconnection electric field. This Letter addresses specific types of E_{∥} events, which appear as large-amplitude, near unipolar spikes that are associated with tangled, reconnected magnetic fields. These E_{∥} events are primarily in or near a current layer near the separatrix and are interpreted to be double layers that may be responsible for secondary reconnection in tangled magnetic fields or flux ropes. These results are telling of the three-dimensional nature of magnetopause reconnection and indicate that magnetopause reconnection may be often patchy and/or drive turbulence along the separatrix that results in flux ropes and/or tangled magnetic fields.
我们报告了磁层多尺度卫星对地球磁层顶日下区域与磁重联相关的平行电场（E∥）的观测结果。电子扩散区附近的E∥事件振幅约为100 mV/m，远大于反平行重联电场的预测值。本信函讨论了特定类型的E∥事件，这些事件表现为与缠结、重联磁场相关的大幅近单极尖峰。这些E∥事件主要出现在磁分界面附近的电流层内或其附近，被解释为双层结构，可能导致缠结磁场或通量绳中的二次重联。这些结果揭示了磁层顶重联的三维性质，表明磁层顶重联可能常常是不连续的，和/或沿着磁分界面驱动湍流，从而产生通量绳和/或缠结磁场。
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