Numerical simulations of magnetic reconnection in an asymmetric current sheet

Wang Peiran; HuangCan; Lu Quanming; WangShui

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Numerical simulations of magnetic reconnection in an asymmetric current sheet

Wang Peiran 1,HuangCan 2,Lu Quanming 2 * #,WangShui 2

1.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei 230026

2.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei, 230026

*Correspondence author

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Funding: none

Opened online: 2 August 2013

Accepted by: none

Citation: Wang Peiran,HuangCan,Lu Quanming.Numerical simulations of magnetic reconnection in an asymmetric current sheet[OL]. [ 2 August 2013] http://en.paper.edu.cn/en_releasepaper/content/4553296

Magnetic reconnection in a symmetric current sheet has been thoroughly investigated in previous studies. The out-of-plane magnetic field is found to have a quadrupole structure in the diffusion region. The perpendicular electric field and the parallel electric field with a bipolar structure exist around the four separatrices. In this paper, by performing two-dimensional (2-D) particle-in-cell (PIC) simulations, we investigate the electric and magnetic structures of magnetic reconnection in an asymmetric current sheet. Compared with magnetic reconnection in a symmetric current sheet, the quadrupole structure of the out-of-plane magnetic field now disappears in the diffusion region, and both the parallel and perpendicular electric field only exist in the upper separatrices. The parallel electric field with a bipolar structure is considered to be the results of the nonlinear evolution of the Buneman instability, which is excited by the high-speed electron flow formed after their acceleration around the X line. The disappearance of the parallel electric field around the lower separatrices may be due to the transverse instability, which is unstable in a weak magnetized plasma.

Keywords:Magnetic reconnection; electron hole; Buneman instability

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