Wilder F D, Ergun R E, Eriksson S, Phan T D, Burch J L, Ahmadi N, Goodrich K A, Newman D L, Trattner K J, Torbert R B, Giles B L, Strangeway R J, Magnes W, Lindqvist P-A, Khotyaintsev Yu-V
Laboratory of Atmospheric and Space Sciences, University of Colorado, Boulder, Colorado 80303, USA.
Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, Colorado 80303, USA.
Phys Rev Lett. 2017 Jun 30;118(26):265101. doi: 10.1103/PhysRevLett.118.265101. Epub 2017 Jun 29.
We report observations from the Magnetospheric Multiscale (MMS) satellites of the electron jet in a symmetric magnetic reconnection event with moderate guide field. All four spacecraft sampled the ion diffusion region and observed the electron exhaust. The observations suggest that the presence of the guide field leads to an asymmetric Hall field, which results in an electron jet skewed towards the separatrix with a nonzero component along the magnetic field. The jet appears in conjunction with a spatially and temporally persistent parallel electric field ranging from -3 to -5 mV/m, which led to dissipation on the order of 8 nW/m^{3}. The parallel electric field heats electrons that drift through it, and is associated with a streaming instability and electron phase space holes.
我们报告了磁层多尺度（MMS）卫星在具有中等导向场的对称磁重联事件中对电子喷流的观测结果。所有四颗航天器都对离子扩散区域进行了采样，并观测到了电子耗尽区。观测结果表明，导向场的存在导致了不对称的霍尔电场，这使得电子喷流向磁分界面倾斜，并且沿磁场方向具有非零分量。该喷流与一个空间和时间上持续存在的平行电场一同出现，该电场强度范围为-3至-5 mV/m，导致了约8 nW/m³的耗散。平行电场加热了漂移通过它的电子，并且与流不稳定性和电子相空间空洞有关。
