skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Computer studies on the fast reconnection mechanism under an externally driven boundary condition

Abstract

Computer simulations study the temporal dynamics of magnetic reconnection in a current sheet system under a continuous local plasma injection imposed on the inflow boundary. The basic reconnection process is strongly influenced by the resistivity model. For a uniform resistivity model, the field lines become flattened with time so that the resulting quasisteady configuration involves a long diffusion region and the reconnection rate strongly depends on the resistivity, in good agreement with the Sweet--Parker mechanism. For an anomalous resistivity model, magnetic reconnection drastically occurs, leading to development of a large-scale plasmoid. Once an effective resistivity is triggered, a quasisteady fast reconnection mechanism spontaneously develops even in the absence of the specified boundary condition, in good agreement with the spontaneous fast reconnection model. When the imposed plasma injection is larger than the one inherent to the spontaneous fast reconnection mechanism, the fast reconnection mechanism can no longer proceed steadily and multiple X points and plasmoids result. It is concluded that it is not the boundary condition that drives the fast reconnection mechanism; the boundary condition may simply initiate the onset of magnetic reconnection (or effective resistivity) but has no essential effect on the fast reconnection development.

Authors:
 [1]
  1. Department of Computer Science, Faculty of Engineering, Ehime University, Matsuyama 790 (Japan)
Publication Date:
OSTI Identifier:
6691033
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas; (United States)
Additional Journal Information:
Journal Volume: 1:9; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNETIC RECONNECTION; BOUNDARY CONDITIONS; COMPUTER CALCULATIONS; DIFFUSION; MAGNETIC REYNOLDS NUMBER; MAGNETIC STORMS; MAGNETOHYDRODYNAMICS; NUMERICAL SOLUTION; PLASMA SIMULATION; PLASMOIDS; SHOCK WAVES; SOLAR FLARES; FLUID MECHANICS; HYDRODYNAMICS; MECHANICS; REYNOLDS NUMBER; SIMULATION; SOLAR ACTIVITY; 700370* - Plasma Fluid & MHD Properties- (1992-); 700330 - Plasma Kinetics, Transport, & Impurities- (1992-); 700340 - Plasma Waves, Oscillations, & Instabilities- (1992-)

Citation Formats

Ugai, M. Computer studies on the fast reconnection mechanism under an externally driven boundary condition. United States: N. p., 1994. Web. doi:10.1063/1.870524.
Ugai, M. Computer studies on the fast reconnection mechanism under an externally driven boundary condition. United States. https://doi.org/10.1063/1.870524
Ugai, M. Thu . "Computer studies on the fast reconnection mechanism under an externally driven boundary condition". United States. https://doi.org/10.1063/1.870524.
@article{osti_6691033,
title = {Computer studies on the fast reconnection mechanism under an externally driven boundary condition},
author = {Ugai, M},
abstractNote = {Computer simulations study the temporal dynamics of magnetic reconnection in a current sheet system under a continuous local plasma injection imposed on the inflow boundary. The basic reconnection process is strongly influenced by the resistivity model. For a uniform resistivity model, the field lines become flattened with time so that the resulting quasisteady configuration involves a long diffusion region and the reconnection rate strongly depends on the resistivity, in good agreement with the Sweet--Parker mechanism. For an anomalous resistivity model, magnetic reconnection drastically occurs, leading to development of a large-scale plasmoid. Once an effective resistivity is triggered, a quasisteady fast reconnection mechanism spontaneously develops even in the absence of the specified boundary condition, in good agreement with the spontaneous fast reconnection model. When the imposed plasma injection is larger than the one inherent to the spontaneous fast reconnection mechanism, the fast reconnection mechanism can no longer proceed steadily and multiple X points and plasmoids result. It is concluded that it is not the boundary condition that drives the fast reconnection mechanism; the boundary condition may simply initiate the onset of magnetic reconnection (or effective resistivity) but has no essential effect on the fast reconnection development.},
doi = {10.1063/1.870524},
url = {https://www.osti.gov/biblio/6691033}, journal = {Physics of Plasmas; (United States)},
issn = {1070-664X},
number = ,
volume = 1:9,
place = {United States},
year = {1994},
month = {9}
}