磁重联中纯电子外流的直接观测。

Direct observations of pure electron outflow in magnetic reconnection.

作者信息

Sakai K, Moritaka T, Morita T, Tomita K, Minami T, Nishimoto T, Egashira S, Ota M, Sakawa Y, Ozaki N, Kodama R, Kojima T, Takezaki T, Yamazaki R, Tanaka S J, Aihara K, Koenig M, Albertazzi B, Mabey P, Woolsey N, Matsukiyo S, Takabe H, Hoshino M, Kuramitsu Y

机构信息

Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.

Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan.

出版信息

Sci Rep. 2022 Jun 30;12(1):10921. doi: 10.1038/s41598-022-14582-3.

DOI:10.1038/s41598-022-14582-3

PMID:35773286

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9247195/

Abstract

Magnetic reconnection is a universal process in space, astrophysical, and laboratory plasmas. It alters magnetic field topology and results in energy release to the plasma. Here we report the experimental results of a pure electron outflow in magnetic reconnection, which is not accompanied with ion flows. By controlling an applied magnetic field in a laser produced plasma, we have constructed an experiment that magnetizes the electrons but not the ions. This allows us to isolate the electron dynamics from the ions. Collective Thomson scattering measurements reveal the electron Alfvénic outflow without ion outflow. The resultant plasmoid and whistler waves are observed with the magnetic induction probe measurements. We observe the unique features of electron-scale magnetic reconnection simultaneously in laser produced plasmas, including global structures, local plasma parameters, magnetic field, and waves.

摘要

磁重联是空间、天体物理和实验室等离子体中的一个普遍过程。它会改变磁场拓扑结构，并导致能量释放到等离子体中。在此，我们报告磁重联中纯电子流出的实验结果，该过程不伴随离子流。通过控制激光产生等离子体中的外加磁场，我们构建了一个使电子磁化而离子未被磁化的实验。这使我们能够将电子动力学与离子动力学隔离开来。集体汤姆逊散射测量揭示了没有离子流出的电子阿尔文流出。通过磁感应探针测量观察到了由此产生的等离子体团和哨声波。我们在激光产生的等离子体中同时观测到了电子尺度磁重联的独特特征，包括整体结构、局部等离子体参数、磁场和波。