Electron dynamics in collisionless magnetic reconnection with a PIC simulation |
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Authors: | Jun Guo |
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Institution: | (1) School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao, 266042, China;(2) State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing, 100080, China |
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Abstract: | Two-dimensional particle-in-cell (PIC) simulation is used to investigate electron dynamics in collisionless magnetic reconnection,
and the proton/electron mass ratio is taken to be m
i
/m
e
= 256. The results show that the presence of a strong initial guide field will change the direction of the electron flow.
The electron density cavities and the parallel electric field can be found in the electron inflow region along the separatrix,
and the electron inflow and density cavities only appear in the second and fourth quadrants. What is different from the results
with a smaller mass ratio is that new structures appear in the diffusion region near the X line: (1) Narrow regions of density enhancement and density cavities can be found synchronously in this region; and (2) corresponding
to the electron density changes near the X line, the strong parallel electric fields are found to occur in the first and third quadrants. These electric fields perhaps
play a more important role in acceleration and heating electrons than those fields located in the density cavities.
Supported by National Natural Science Foundation of China (Grant No. 40725013) and Open Research Program Foundation of State
Key Laboratory for Space Weather, Chinese Academy Sciences |
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Keywords: | collisionless magnetic reconnection particle-in-cell simulation guide field electron dynamics mass ratio |
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