Morphology and dynamics of three interacting kink-unstable flux ropes in a laboratory magnetoplasma
Morphology and dynamics of three interacting kink-unstable flux ropes in a laboratory magnetoplasma
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实验室磁等离子体中三个相互作用的扭结不稳定磁通绳的形态和动力学
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. Gekelman
中科院分区：
文献类型：
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作者：
B. V. Compernolle;W. Gekelman
通量绳在太空和太阳等离子体中无处不在。在日冕和地球磁尾中，通常都能观察到多条相邻的磁绳。相邻磁通绳之间的相互作用通常是动态的，并可能导致磁重联。本文在低β本底的实验室磁等离子体中研究了三种磁绳的相互作用。磁绳的磁结构是由场向定向的有限大小电流的极向场加上引导磁场而产生的，从而形成典型的螺旋场线结构。每根绳索产生的磁场约为导向场的几分之一。获得了体磁场数据，从而可以重建磁通绳的磁场结构和动力学。发现磁通绳以阿尔芬速度传播。观察到了熔剂绳的合并和反弹。绳索在等离子体中传播时会扭曲和扭动。他们被绑在一起，在……处清楚地分开。
Flux ropes are ubiquitous in space and solar plasmas. Multiple adjacent flux ropes are commonly observed both in the solar corona and in the earth's magnetotail. The interaction of adjacent flux ropes is often dynamic and can lead to magnetic reconnection. In this paper, the interaction of three flux ropes is studied in a low β background laboratory magnetoplasma. The magnetic structure of the flux rope is produced by the poloidal field of a field-aligned finite sized current which adds to the guide magnetic field and creates the typical helical field line structure. Each rope produces magnetic fields on the order of a few percent of the guide field. Volumetric magnetic field data were acquired and the magnetic field structure and dynamics of the flux ropes can thus be reconstructed. The flux ropes are found to propagate at the Alfven speed. Merging and bouncing of the flux ropes have been observed. The ropes twist and writhe as they propagate through the plasma. They are line tied and clearly separate at...