Spontaneous growth of the reconnection electric field during magnetic reconnection with a guide field: A theoretical model and particle-in-cell simulations

doi:10.1088/1674-1056/ab8da0

中国物理B ›› 2020, Vol. 29 ›› Issue (7): 75202-075202.doi: 10.1088/1674-1056/ab8da0

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Spontaneous growth of the reconnection electric field during magnetic reconnection with a guide field: A theoretical model and particle-in-cell simulations

Kai Huang(黄楷), Quan-Ming Lu(陆全明), Rong-Sheng Wang(王荣生), Shui Wang(王水)

1 Key Laboratory of Geospace Environment, Chinese Academy of Sciences, Department of Geophysics and Planetary Science, 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:2020-02-11 修回日期:2020-04-21 出版日期:2020-07-05 发布日期:2020-07-05
通讯作者: Quan-Ming Lu E-mail:qmlu@ustc.edu.cn
基金资助:
Project supported by the National Natural Science of China (Grant Nos. 41527804 and 41774169), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB 41000000), and the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. QYZDJ-SSW-DQC010).

Spontaneous growth of the reconnection electric field during magnetic reconnection with a guide field: A theoretical model and particle-in-cell simulations

Kai Huang(黄楷)^1,2, Quan-Ming Lu(陆全明)^1,2, Rong-Sheng Wang(王荣生)^1,2, Shui Wang(王水)^1,2

1 Key Laboratory of Geospace Environment, Chinese Academy of Sciences, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei 230026, China;
2 CAS Center for Excellence in Comparative Planetology, Hefei 230026, China

Received:2020-02-11 Revised:2020-04-21 Online:2020-07-05 Published:2020-07-05
Contact: Quan-Ming Lu E-mail:qmlu@ustc.edu.cn
Supported by:
Project supported by the National Natural Science of China (Grant Nos. 41527804 and 41774169), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB 41000000), and the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. QYZDJ-SSW-DQC010).

摘要/Abstract

摘要： Reconnection electric field is a key element of magnetic reconnection. It quantifies the change of magnetic topology and the dissipation of magnetic energy. In this work, two-dimensional (2D) particle-in-cell (PIC) simulations are performed to study the growth of the reconnection electric field in the electron diffusion region (EDR) during magnetic reconnection with a guide field. At first, a seed electric field is produced due to the excitation of the tearing-mode instability. Then, the reconnection electric field in the EDR, which is dominated by the electron pressure tensor term, suffers a spontaneous growth stage and grows exponentially until it saturates. A theoretical model is also proposed to explain such a kind of growth. The reconnection electric field in the EDR is found to be directly proportional to the electron outflow speed. The time derivative of electron outflow speed is proportional to the reconnection electric field in the EDR because the outflow is formed after the inflow electrons are accelerated by the reconnection electric field in the EDR and then directed away along the outflow direction. This kind of reinforcing process at last leads to the exponential growth of the reconnection electric field in the EDR.

关键词: magnetic reconnection, reconnection electric field, electron diffusion region, particle-in-cell simulation

Abstract: Reconnection electric field is a key element of magnetic reconnection. It quantifies the change of magnetic topology and the dissipation of magnetic energy. In this work, two-dimensional (2D) particle-in-cell (PIC) simulations are performed to study the growth of the reconnection electric field in the electron diffusion region (EDR) during magnetic reconnection with a guide field. At first, a seed electric field is produced due to the excitation of the tearing-mode instability. Then, the reconnection electric field in the EDR, which is dominated by the electron pressure tensor term, suffers a spontaneous growth stage and grows exponentially until it saturates. A theoretical model is also proposed to explain such a kind of growth. The reconnection electric field in the EDR is found to be directly proportional to the electron outflow speed. The time derivative of electron outflow speed is proportional to the reconnection electric field in the EDR because the outflow is formed after the inflow electrons are accelerated by the reconnection electric field in the EDR and then directed away along the outflow direction. This kind of reinforcing process at last leads to the exponential growth of the reconnection electric field in the EDR.

Key words: magnetic reconnection, reconnection electric field, electron diffusion region, particle-in-cell simulation

中图分类号: (Magnetic reconnection)

52.35.Vd

52.65.Rr (Particle-in-cell method) 52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)) 94.05.-a (Space plasma physics)

黄楷, 陆全明, 王荣生, 王水. Spontaneous growth of the reconnection electric field during magnetic reconnection with a guide field: A theoretical model and particle-in-cell simulations[J]. 中国物理B, 2020, 29(7): 75202-075202.

Kai Huang(黄楷), Quan-Ming Lu(陆全明), Rong-Sheng Wang(王荣生), Shui Wang(王水). Spontaneous growth of the reconnection electric field during magnetic reconnection with a guide field: A theoretical model and particle-in-cell simulations[J]. Chin. Phys. B, 2020, 29(7): 75202-075202.

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Spontaneous growth of the reconnection electric field during magnetic reconnection with a guide field: A theoretical model and particle-in-cell simulations

Spontaneous growth of the reconnection electric field during magnetic reconnection with a guide field: A theoretical model and particle-in-cell simulations

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