Eriksson S, Wilder F D, Ergun R E, Schwartz S J, Cassak P A, Burch J L, Chen L-J, Torbert R B, Phan T D, Lavraud B, Goodrich K A, Holmes J C, Stawarz J E, Sturner A P, Malaspina D M, Usanova M E, Trattner K J, Strangeway R J, Russell C T, Pollock C J, Giles B L, Hesse M, Lindqvist P-A, Drake J F, Shay M A, Nakamura R, Marklund G T
Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80303, USA.
Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, Colorado 80303, USA.
Phys Rev Lett. 2016 Jul 1;117(1):015001. doi: 10.1103/PhysRevLett.117.015001.
We report observations from the Magnetospheric Multiscale (MMS) satellites of a large guide field magnetic reconnection event. The observations suggest that two of the four MMS spacecraft sampled the electron diffusion region, whereas the other two spacecraft detected the exhaust jet from the event. The guide magnetic field amplitude is approximately 4 times that of the reconnecting field. The event is accompanied by a significant parallel electric field (E_{∥}) that is larger than predicted by simulations. The high-speed (∼300 km/s) crossing of the electron diffusion region limited the data set to one complete electron distribution inside of the electron diffusion region, which shows significant parallel heating. The data suggest that E_{∥} is balanced by a combination of electron inertia and a parallel gradient of the gyrotropic electron pressure.
我们报告了磁层多尺度（MMS）卫星对一次大型引导场磁重联事件的观测结果。观测表明，四颗MMS航天器中的两颗对电子扩散区进行了采样，而另外两颗航天器探测到了该事件的喷流。引导磁场幅度约为重联场的4倍。该事件伴随着一个显著的平行电场（E∥），其强度大于模拟预测值。电子扩散区的高速（约300 km/s）穿越将数据集限制为电子扩散区内一个完整的电子分布，该分布显示出显著的平行加热。数据表明，E∥由电子惯性和回旋电子压力的平行梯度共同平衡。
