Three-dimensional magnetic reconnection in complex multiple X-point configurations in an ancient solar-lunar terrestrial system

doi:10.1088/1674-1056/ad0b02

中国物理B ›› 2024, Vol. 33 ›› Issue (3): 35202-035202.doi: 10.1088/1674-1056/ad0b02

Three-dimensional magnetic reconnection in complex multiple X-point configurations in an ancient solar-lunar terrestrial system

Xiang-Lei He(何向磊)¹, Ao-Hua Mao(毛傲华)^1,2,†, Meng-Meng Sun(孙萌萌)¹, Ji-Tong Zou(邹继同)¹, and Xiao-Gang Wang(王晓钢)^1,2

1 School of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 Laboratory for Space Environment and Materials Science, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2023-08-31 修回日期:2023-11-05 接受日期:2023-11-09 出版日期:2024-02-22 发布日期:2024-02-29
通讯作者: Ao-Hua Mao E-mail:aohuamao@hit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11975087, 42261134533, and 42011530086), the National Magnetic Confinement Fusion Energy Research and Development Program of China (Grant No. 2022YFE03190400), and the Heilongjiang Touyan Innovation Team Program, China.

Three-dimensional magnetic reconnection in complex multiple X-point configurations in an ancient solar-lunar terrestrial system

Xiang-Lei He(何向磊)¹, Ao-Hua Mao(毛傲华)^1,2,†, Meng-Meng Sun(孙萌萌)¹, Ji-Tong Zou(邹继同)¹, and Xiao-Gang Wang(王晓钢)^1,2

1 School of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 Laboratory for Space Environment and Materials Science, Harbin Institute of Technology, Harbin 150001, China

Received:2023-08-31 Revised:2023-11-05 Accepted:2023-11-09 Online:2024-02-22 Published:2024-02-29
Contact: Ao-Hua Mao E-mail:aohuamao@hit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11975087, 42261134533, and 42011530086), the National Magnetic Confinement Fusion Energy Research and Development Program of China (Grant No. 2022YFE03190400), and the Heilongjiang Touyan Innovation Team Program, China.

摘要/Abstract

摘要： Magnetic reconnection processes in three-dimensional (3D) complex field configurations have been investigated in different magneto-plasma systems in space, laboratory, and astrophysical systems. Two-dimensional (2D) features of magnetic reconnection have been well developed and applied successfully to systems with symmetrical property, such as toroidal fusion plasmas and laboratory experiments with an axial symmetry. But in asymmetric systems, the 3D features are inevitably different from those in the 2D case. Magnetic reconnection structures in multiple celestial body systems, particularly star-planet-Moon systems, bring fresh insights to the understanding of the 3D geometry of reconnection. Thus, we take magnetic reconnection in an ancient solar-lunar terrestrial magneto-plasma system as an example by using its crucial parameters approximately estimated already and also some specific applications in pathways for energy and matter transports among Earth, ancient Moon, and the interplanetary magnetic field (IMF). Then, magnetic reconnection of the ancient lunar-terrestrial magnetospheres with the IMF is investigated numerically in this work. In a 3D simulation for the Earth-Moon-IMF system, topological features of complex magnetic reconnection configurations and dynamical characteristics of magnetic reconnection processes are studied. It is found that a coupled lunar-terrestrial magnetosphere is formed, and under various IMF orientations, multiple X-points emerge at distinct locations, showing three typical magnetic reconnection structures in such a geometry, i.e., the X-line, the triple current sheets, and the A-B null pairs. The results can conduce to further understanding of reconnection physics in 3D for plasmas in complex magnetic configurations, and also a possible mechanism for energy and matters transport in evolutions of similar astrophysical systems.

关键词: magnetic reconnection, multiple X-points, complex magneto-plasma system

Abstract: Magnetic reconnection processes in three-dimensional (3D) complex field configurations have been investigated in different magneto-plasma systems in space, laboratory, and astrophysical systems. Two-dimensional (2D) features of magnetic reconnection have been well developed and applied successfully to systems with symmetrical property, such as toroidal fusion plasmas and laboratory experiments with an axial symmetry. But in asymmetric systems, the 3D features are inevitably different from those in the 2D case. Magnetic reconnection structures in multiple celestial body systems, particularly star-planet-Moon systems, bring fresh insights to the understanding of the 3D geometry of reconnection. Thus, we take magnetic reconnection in an ancient solar-lunar terrestrial magneto-plasma system as an example by using its crucial parameters approximately estimated already and also some specific applications in pathways for energy and matter transports among Earth, ancient Moon, and the interplanetary magnetic field (IMF). Then, magnetic reconnection of the ancient lunar-terrestrial magnetospheres with the IMF is investigated numerically in this work. In a 3D simulation for the Earth-Moon-IMF system, topological features of complex magnetic reconnection configurations and dynamical characteristics of magnetic reconnection processes are studied. It is found that a coupled lunar-terrestrial magnetosphere is formed, and under various IMF orientations, multiple X-points emerge at distinct locations, showing three typical magnetic reconnection structures in such a geometry, i.e., the X-line, the triple current sheets, and the A-B null pairs. The results can conduce to further understanding of reconnection physics in 3D for plasmas in complex magnetic configurations, and also a possible mechanism for energy and matters transport in evolutions of similar astrophysical systems.

Key words: magnetic reconnection, multiple X-points, complex magneto-plasma system

中图分类号: (Magnetohydrodynamic and fluid equation)

52.65.Kj

94.30.cp (Magnetic reconnection) 96.12.Hg (Magnetic field and magnetism)

Xiang-Lei He(何向磊), Ao-Hua Mao(毛傲华), Meng-Meng Sun(孙萌萌), Ji-Tong Zou(邹继同), and Xiao-Gang Wang(王晓钢). Three-dimensional magnetic reconnection in complex multiple X-point configurations in an ancient solar-lunar terrestrial system[J]. 中国物理B, 2024, 33(3): 35202-035202.

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Three-dimensional magnetic reconnection in complex multiple X-point configurations in an ancient solar-lunar terrestrial system

Three-dimensional magnetic reconnection in complex multiple X-point configurations in an ancient solar-lunar terrestrial system

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