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Experimental observation of kinetic Alfvén wave generated by magnetic reconnection

Peiyun Shi, Kai Huang, Quanming Lu, Xuan Sun2019年Plasma Physics and Controlled FusionIF 2.2出版社

The transient nature of magnetic reconnection dictates that it must be accompanied by rich electromagnetic wave activity, which can in turn affect the reconnection process. Interaction between Alfvén waves and reconnection has been simulated and recently observed in space. In this paper we report the first laboratory observation of a kinetic Alfvén wave (KAW) mode during reconnection in a linear device. The reconnection was measured by magnetic probes and the enhancement of light emission during reconnection was captured by a fast camera. The perpendicular wave pattern suggests it is an m = −2 mode rotating in ion diamagnetism direction. The wave data agrees with the theoretical prediction of KAW. The temporal correlation between KAW amplitude and reconnection rate indicates waves are generated by reconnection.

日本語訳

磁気リコネクションの過渡的性質は、それが豊かな電磁波活動を伴うことを必然的に意味し、その電磁波活動は逆にリコネクション過程に影響を及ぼし得る。アルフヴェン波とリコネクションの間の相互作用は、シミュレーションおよび近年の宇宙空間での観測によって研究されてきた。本論文では、直線装置におけるリコネクション中に運動論的アルフヴェン波(KAW)モードを実験室で初めて観測したことを報告する。リコネクションは磁気プローブによって測定され、リコネクション中の発光の増強は高速カメラによって捉えられた。垂直方向の波動パターンは、イオン反磁性方向に回転するm = −2モードであることを示唆している。波動データはKAWの理論的予測と一致する。KAWの振幅とリコネクション率の間の時間的相関は、波動がリコネクションによって生成されることを示している。

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Alfvén waveMagnetic reconnectionKinetic Alfvén wave
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