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Title: Fast collisionless reconnection in electron-positron plasmas

Abstract

Magnetic reconnection in electron-positron (pair) plasmas is studied by two-dimensional, electromagnetic, particle-in-cell simulations. In pair plasmas, the Hall current does not appear because there is no scale separation between ion and electron motion. Simulations show that fast reconnection is realized in both nonrelativistic and relativistic regimes. It is demonstrated that the divergence of the electron and positron pressure tensors essentially plays the role of an effective collisionless resistivity in realizing fast reconnection. Since there is no Hall current in pair plasmas, there is no quadrupolar structure in the out-of-plane magnetic field. Particle acceleration by reconnection is investigated. Major sites of particle acceleration are the regions in the vicinity of X lines, where ultrarelativistic particles are generated by the reconnection electric field.

Authors:
;  [1]
  1. Space Science Center and Center for Magnetic Self-Organization, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire 03824 (United States)
Publication Date:
OSTI Identifier:
20975076
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 5; Other Information: DOI: 10.1063/1.2714020; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; ELECTRIC FIELDS; ELECTRONS; MAGNETIC FIELDS; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; PLASMA PRESSURE; PLASMA SIMULATION; POSITRONS; RELATIVISTIC PLASMA; RELATIVISTIC RANGE; TENSORS; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Bessho, Naoki, and Bhattacharjee, A. Fast collisionless reconnection in electron-positron plasmas. United States: N. p., 2007. Web. doi:10.1063/1.2714020.
Bessho, Naoki, & Bhattacharjee, A. Fast collisionless reconnection in electron-positron plasmas. United States. doi:10.1063/1.2714020.
Bessho, Naoki, and Bhattacharjee, A. Tue . "Fast collisionless reconnection in electron-positron plasmas". United States. doi:10.1063/1.2714020.
@article{osti_20975076,
title = {Fast collisionless reconnection in electron-positron plasmas},
author = {Bessho, Naoki and Bhattacharjee, A.},
abstractNote = {Magnetic reconnection in electron-positron (pair) plasmas is studied by two-dimensional, electromagnetic, particle-in-cell simulations. In pair plasmas, the Hall current does not appear because there is no scale separation between ion and electron motion. Simulations show that fast reconnection is realized in both nonrelativistic and relativistic regimes. It is demonstrated that the divergence of the electron and positron pressure tensors essentially plays the role of an effective collisionless resistivity in realizing fast reconnection. Since there is no Hall current in pair plasmas, there is no quadrupolar structure in the out-of-plane magnetic field. Particle acceleration by reconnection is investigated. Major sites of particle acceleration are the regions in the vicinity of X lines, where ultrarelativistic particles are generated by the reconnection electric field.},
doi = {10.1063/1.2714020},
journal = {Physics of Plasmas},
number = 5,
volume = 14,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}