Electron acceleration during magnetic islands coalescence and division process in a guide field reconnection

doi:10.1088/1674-1056/ac21c0

中国物理B ›› 2022, Vol. 31 ›› Issue (2): 25202-025202.doi: 10.1088/1674-1056/ac21c0

Electron acceleration during magnetic islands coalescence and division process in a guide field reconnection

Shengxing Han(韩圣星)^1,2, Huanyu Wang(王焕宇)^1,2,†, and Xinliang Gao(高新亮)^1,2

1 CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;
2 CAS Center for Excellence in Comparative Planetology, Hefei 230026, China

收稿日期:2021-04-13 修回日期:2021-08-01 接受日期:2021-08-27 出版日期:2022-01-13 发布日期:2022-01-13
通讯作者: Huanyu Wang E-mail:iuwon@mail.ustc.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 41804159 and 41774169) and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDJ-SSW-DQC010).

Electron acceleration during magnetic islands coalescence and division process in a guide field reconnection

Shengxing Han(韩圣星)^1,2, Huanyu Wang(王焕宇)^1,2,†, and Xinliang Gao(高新亮)^1,2

1 CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;
2 CAS Center for Excellence in Comparative Planetology, Hefei 230026, China

Received:2021-04-13 Revised:2021-08-01 Accepted:2021-08-27 Online:2022-01-13 Published:2022-01-13
Contact: Huanyu Wang E-mail:iuwon@mail.ustc.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 41804159 and 41774169) and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDJ-SSW-DQC010).

摘要/Abstract

摘要： The magnetic merging process related to pairwise magnetic islands coalescence is investigated by two-dimensional particle-in-cell simulations with a guide field. Owing to the force of attraction between parallel currents within the initial magnetic islands, the magnetic islands begin to approach each other and merge into one big island. We find that this newly formed island is unstable and can be divided into two small magnetic islands spontaneously. Lastly, these two small islands merge again. We follow the time evolution of this process, in which the contributions of three mechanisms of electron acceleration at different stages, including the Fermi, parallel electric field, and betatron mechanisms, are studied with the guide center theory.

关键词: magnetic reconnection, magnetic islands, electron acceleration, particle-in-cell simulation

Abstract: The magnetic merging process related to pairwise magnetic islands coalescence is investigated by two-dimensional particle-in-cell simulations with a guide field. Owing to the force of attraction between parallel currents within the initial magnetic islands, the magnetic islands begin to approach each other and merge into one big island. We find that this newly formed island is unstable and can be divided into two small magnetic islands spontaneously. Lastly, these two small islands merge again. We follow the time evolution of this process, in which the contributions of three mechanisms of electron acceleration at different stages, including the Fermi, parallel electric field, and betatron mechanisms, are studied with the guide center theory.

Key words: magnetic reconnection, magnetic islands, electron acceleration, particle-in-cell simulation

中图分类号: (Magnetic reconnection)

52.35.Vd

52.65.-y (Plasma simulation) 52.65.Rr (Particle-in-cell method) 94.20.wc (Plasma motion; plasma convection; particle acceleration)

Shengxing Han(韩圣星), Huanyu Wang(王焕宇), and Xinliang Gao(高新亮). Electron acceleration during magnetic islands coalescence and division process in a guide field reconnection[J]. 中国物理B, 2022, 31(2): 25202-025202.

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Electron acceleration during magnetic islands coalescence and division process in a guide field reconnection

Electron acceleration during magnetic islands coalescence and division process in a guide field reconnection

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