Brookhart Matthew I, Stemo Aaron, Zuberbier Amanda, Zweibel Ellen, Forest Cary B
University of Wisconsin-Madison, Madison, Wisconsin, USA.
Phys Rev Lett. 2015 Apr 10;114(14):145001. doi: 10.1103/PhysRevLett.114.145001. Epub 2015 Apr 6.
This Letter reports the first experimental investigation into a line-tied plasma with a reversed current profile. Discrete current sources create a cylindrical plasma equilibrium with an axial field and zero net current. Detailed magnetic measurements show that an internal m=1 mode with no external character grows exponentially. The nonlinear evolution of the mode drives 3D reconnection events that reorganize the plasma equilibrium. The plasma is turbulent and exhibits reconnection events on a range of scales. These data are consistent with recent simulations of coronal loops and the nanoflare coronal heating mechanism.
本信函报道了对具有反向电流分布的线约束等离子体的首次实验研究。离散电流源产生了一个具有轴向场和零净电流的圆柱形等离子体平衡态。详细的磁测量表明，一种没有外部特征的内部m = 1模呈指数增长。该模式的非线性演化驱动了三维重联事件，这些事件重组了等离子体平衡态。等离子体是湍流的，并在一系列尺度上呈现重联事件。这些数据与日冕环的近期模拟以及纳米耀斑日冕加热机制相一致。
