Dissipation mechanism in 3D magnetic reconnection

Fujimoto, Keizo

doi:10.1063/1.3642609

Title: Dissipation mechanism in 3D magnetic reconnection

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Abstract

Dissipation processes responsible for fast magnetic reconnection in collisionless plasmas are investigated using 3D electromagnetic particle-in-cell simulations. The present study revisits the two simulation runs performed in the previous study (Fujimoto, Phys. Plasmas 16, 042103 (2009)); one with small system size in the current density direction, and the other with larger system size. In the case with small system size, the reconnection processes are almost the same as those in 2D reconnection, while in the other case a kink mode evolves along the current density and deforms the current sheet structure drastically. Although fast reconnection is achieved in both the cases, the dissipation mechanism is very different between them. In the case without kink mode, the electrons transit the electron diffusion region without thermalization, so that the magnetic dissipation is supported by the inertia resistivity alone. On the other hand, in the kinked current sheet, the electrons are not only accelerated in bulk, but they are also partly scattered and thermalized by the kink mode, which results in the anomalous resistivity in addition to the inertia resistivity. It is demonstrated that in 3D reconnection the thickness of the electron current sheet becomes larger than the local electron inertia length, consistentmore »« less

Authors:

Fujimoto, Keizo ^[1]

Computational Astrophysics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

Publication Date:: Tue Nov 15 00:00:00 EST 2011

OSTI Identifier:: 22047036

Resource Type:: Journal Article

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 18; Journal Issue: 11; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CHARGED-PARTICLE TRANSPORT; COLLISIONLESS PLASMA; CURRENT DENSITY; DIFFUSION; ELECTRONS; KINK INSTABILITY; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; MOMENT OF INERTIA; PLASMA DENSITY; PLASMA SIMULATION; THERMALIZATION

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                    Fujimoto, Keizo. Dissipation mechanism in 3D magnetic reconnection.  United States: N. p., 2011. 
        Web.  doi:10.1063/1.3642609.

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                    Fujimoto, Keizo. Dissipation mechanism in 3D magnetic reconnection.  United States.  https://doi.org/10.1063/1.3642609

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                    Fujimoto, Keizo. 2011.  
        "Dissipation mechanism in 3D magnetic reconnection".  United States.  https://doi.org/10.1063/1.3642609.

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@article{osti_22047036,

  title        = {Dissipation mechanism in 3D magnetic reconnection},

  author       = {Fujimoto, Keizo},

  abstractNote = {Dissipation processes responsible for fast magnetic reconnection in collisionless plasmas are investigated using 3D electromagnetic particle-in-cell simulations. The present study revisits the two simulation runs performed in the previous study (Fujimoto, Phys. Plasmas 16, 042103 (2009)); one with small system size in the current density direction, and the other with larger system size. In the case with small system size, the reconnection processes are almost the same as those in 2D reconnection, while in the other case a kink mode evolves along the current density and deforms the current sheet structure drastically. Although fast reconnection is achieved in both the cases, the dissipation mechanism is very different between them. In the case without kink mode, the electrons transit the electron diffusion region without thermalization, so that the magnetic dissipation is supported by the inertia resistivity alone. On the other hand, in the kinked current sheet, the electrons are not only accelerated in bulk, but they are also partly scattered and thermalized by the kink mode, which results in the anomalous resistivity in addition to the inertia resistivity. It is demonstrated that in 3D reconnection the thickness of the electron current sheet becomes larger than the local electron inertia length, consistent with the theoretical prediction in Fujimoto and Sydora (Phys. Plasmas 16, 112309 (2009)).},

  doi          = {10.1063/1.3642609},

  url          = {https://www.osti.gov/biblio/22047036},
  journal      = {Physics of Plasmas},

  issn         = {1070-664X},

  number       = 11,

  volume       = 18,

  place        = {United States},

  year         = {Tue Nov 15 00:00:00 EST 2011},

  month        = {Tue Nov 15 00:00:00 EST 2011}

}

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