Distinctive features of internally driven magnetotail reconnection
Distinctive features of internally driven magnetotail reconnection
复制标题
内部驱动磁尾重联的显着特征
DOI：
10.1002/2017gl072784
复制
发表时间：
2017
影响因子：
5.2
通讯作者：
M. Swisdak
中科院分区：
文献类型：
--
作者：
M. Sitnov;V. Merkin;P. Pritchett;M. Swisdak
采用三维显式粒子模拟研究了具有有限Bz磁场分量的尾状平衡中的重联起始。由于一个区域的尾部Bz梯度的发病发展自发的磁通量释放不稳定性与占主导地位的地球离子流。不稳定性在内部驱动磁场拓扑的变化，而没有任何外部强迫。该制度的显着特点是：以前未报道的霍尔磁场模式;能量转换附近的双极化前的X线形成之前;不对称的能量转换，等离子体加热，和各向异性相对于X线，与区域的离子和电子加热的相位都沿着和跨尾部。这些功能区分内部驱动的重联制度，从类似的过程中反平行磁场配置，以及交换和外部驱动的磁尾重联制度，并可以用来确定不同的制度，在即将到来的磁层多尺度（MMS）的使命尾季节观测。
Onset of reconnection in a tail‐like equilibrium with a finite Bz magnetic field component is studied using 3‐D explicit particle‐in‐cell simulations. Due to a region of a tailward Bz gradient the onset develops spontaneously as the magnetic flux release instability with dominant earthward ion flows. The instability drives the change of magnetic field topology internally, without any external forcing. The distinctive features of this regime are: previously unreported Hall magnetic field patterns; energy conversion near the dipolarization front prior to the X line formation; asymmetry of the energy conversion, plasma heating, and anisotropy relative to the X line, with regions of ion and electron heating out of phase both along and across the tail. These features distinguish the internally driven reconnection regime from similar processes in antiparallel magnetic field configurations as well as interchange and externally driven magnetotail reconnection regimes and can be used to identify the different regimes in upcoming Magnetospheric Multiscale (MMS) mission tail season observations.