Laboratory Observations of Electron Heating and Non-Maxwellian Distributions at the Kinetic Scale during Electron-Only Magnetic Reconnection
Laboratory Observations of Electron Heating and Non-Maxwellian Distributions at the Kinetic Scale during Electron-Only Magnetic Reconnection
复制标题
仅电子磁重联过程中电子加热和动力学尺度非麦克斯韦分布的实验室观察
DOI：
10.1103/physrevlett.128.025002
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发表时间：
2022
影响因子：
8.6
通讯作者：
Swisdak, M.
中科院分区：
文献类型：
--
作者：
Shi, Peiyun;Srivastav, Prabhakar;Barbhuiya, M. Hasan;Cassak, Paul A.;Scime, Earl E.;Swisdak, M.
在实验室等离子体中，在强面外（引导）磁场的作用下，直接测量了由暖体粒子数和冷束组成的非麦克斯韦电子速度分布函数。电子加热局限于分界线，并且电子温度沿着分界线连续增加。测得的焓通量的增益是输入坡印亭通量的70%。电子束在该点的两侧方向相反，它们的速度与电子阿尔文速度相当。粒子模拟与测量结果一致。实验结果与最近在磁鞘中的观测结果一致，并超越了这些观测结果。
Non-Maxwellian electron velocity distribution functions composed of a warm bulk population and a cold beam are directly measured during electron-only reconnection with a strong out-of-plane (guide) magnetic field in a laboratory plasma. Electron heating is localized to the separatrix, and the electron temperature increases continuously along the separatrix. The measured gain in enthalpy flux is 70% of the incoming Poynting flux. The electron beams are oppositely directed on either side of thepoint, and their velocities are comparable to, and scale with, the electron Alfvén speed. Particle-in-cell simulations are consistent with the measurements. The experimental results are consistent with, and go beyond, recent observations in the magnetosheath.