The debate surrounding fast magnetic energy dissipation by magnetic reconnection has remained a fundamental topic in the plasma universe, not only in the Earth's magnetosphere but also in astrophysical objects such as pulsar magnetospheres and magnetars, for more than half a century. Recently, nonthermal particle acceleration and plasma heating during reconnection have been extensively studied, and it has been argued that rapid energy dissipation can occur for a collisionless “thin” current sheet, the thickness of which is of the order of the particle gyroradius. However, it is an intriguing enigma as to how the fast energy dissipation can occur for a “thick” current sheet with thickness larger than the particle gyroradius. Here we demonstrate, using a high-resolution particle-in-cell simulation for a pair plasma, that an explosive reconnection can emerge with the enhancement of the inertia resistivity due to the magnetization of the meandering particles by the reconnecting magnetic field and the shrinkage of the current sheet. In addition, regardless of the initial thickness of the current sheet, the timescale of the nonlinear explosive reconnection is tens of the Alfvén transit time.
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June 2021
Research Article|
June 15 2021
Nonlinear explosive magnetic reconnection in a collisionless system
Masahiro Hoshino
Masahiro Hoshino
a)
Department of Earth and Planetary Science, The University of Tokyo
, Tokyo 113–0033, Japan
a)Author to whom correspondence should be addressed: hoshino@eps.s.u-tokyo.ac.jp
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a)Author to whom correspondence should be addressed: hoshino@eps.s.u-tokyo.ac.jp
Phys. Plasmas 28, 062106 (2021)
Article history
Received:
March 16 2021
Accepted:
May 25 2021
Citation
Masahiro Hoshino; Nonlinear explosive magnetic reconnection in a collisionless system. Phys. Plasmas 1 June 2021; 28 (6): 062106. https://doi.org/10.1063/5.0050389
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