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arXiv 1909.01684physics.plasm-phastro-ph.SRphysics.space-ph
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弱引导场引起磁重联中止的实验室证据

Laboratory evidence of the halting of magnetic reconnection by a weak guide field

S. Bolanos, R. Smets, S. N. Chen, A. Grisolet, E. Filippov, J. L Henares, V. Nastasa, S. Pikuz, R. Riquier, M. Safranova, A. Severin, M. Starodubtsev, J. Fuchs

摘要:

当具有共面但反平行磁场的两个等离子体相遇时,发生磁重联。在接触点处,磁场被局部湮灭,磁能可以释放到周围的等离子体中。理论和数值模拟在处理这一复杂过程中仍然面临许多挑战,其可预测性仍然难以捉摸。在这里,我们测试,通过实验室实验中进行的控制几何形状,改变字段拓扑结构从二维到三维的效果。这是通过施加强度可调的平面外(引导)磁场来实现的。一个强大的减慢,甚至停止对称重联观察到,即使是一个弱导场。与此同时,我们观察到延迟加热的等离子体中的重连区域和修改后的粒子加速,与超Alfvenic流出沿重连层喷射。这些观测突出了在自然和实验室环境中发生的许多重联事件中考虑三维效应的重要性。

英文摘要:

Magnetic reconnection occurs when two plasmas having co-planar but anti-parallel magnetic fields meet. At the contact point, the field is locally annihilated and the magnetic energy can be released into the surrounding plasma. Theory and numerical modelling still face many challenges in handling this complex process, the predictability of which remains elusive. Here we test, through a laboratory experiment conducted in a controlled geometry, the effect of changing the field topology from two-dimensional to three-dimensional. This is done by imposing an out-of-plane (guide) magnetic field of adjustable strength. A strong slowing down or even halting of symmetric reconnection is observed, even for a weak guide-field. Concomitantly, we observe a delayed heating of the plasma in the reconnection region and modified particle acceleration, with super-Alfvenic outflows ejected along the reconnection layer. These observations highlight the importance of taking into account three-dimensional effects in the many reconnection events taking place in natural and laboratory environments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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