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

Title: Magnetohydrodynamic study of three-dimensional instability of the spontaneous fast magnetic reconnection

Abstract

Three-dimensional instability of the spontaneous fast magnetic reconnection is studied with magnetohydrodynamic (MHD) simulation, where the two-dimensional model of the spontaneous fast magnetic reconnection is destabilized in three dimension. Generally, in two-dimensional magnetic reconnection models, every plasma condition is assumed to be uniform in the sheet current direction. In such two-dimensional MHD simulations, the current sheet destabilized by the initial resistive disturbance can be developed to fast magnetic reconnection by a current driven anomalous resistivity. In this paper, the initial resistive disturbance includes a small amount of fluctuations in the sheet current direction, i.e., along the magnetic neutral line. The other conditions are the same as that of previous two-dimensional MHD studies for fast magnetic reconnection. Accordingly, we may expect that approximately two-dimensional fast magnetic reconnection occurs in the MHD simulation. In fact, the fast magnetic reconnection activated on the first stage of the simulation is two dimensional. However, on the subsequent stages, it spontaneously becomes three dimensional and is strongly localized in the sheet current direction. The resulting three-dimensional fast magnetic reconnection intermittently ejects three-dimensional magnetic loops. Such intermittent ejections of the three-dimensional loops are similar to the intermittent downflows observed in the solar flares. The ejection of themore » three-dimensional loops seems to be random but, numerically and theoretically, it is shown that the aspect ratio of the ejected loops is limited under a criterion.« less

Authors:
; ;  [1];  [2]
  1. Department of Computer Science, Ehime University, Matsuyama City 790-8577 (Japan)
  2. Kwasan Observatory, Graduate School of Science, Kyoto University, Kyoto City 607-8471 (Japan)
Publication Date:
OSTI Identifier:
21277104
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 16; Journal Issue: 5; Other Information: DOI: 10.1063/1.3095562; (c) 2009 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; FLUCTUATIONS; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA INSTABILITY; PLASMA SIMULATION; THREE-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Shimizu, T, Kondoh, K, Ugai, M, and Shibata, K. Magnetohydrodynamic study of three-dimensional instability of the spontaneous fast magnetic reconnection. United States: N. p., 2009. Web. doi:10.1063/1.3095562.
Shimizu, T, Kondoh, K, Ugai, M, & Shibata, K. Magnetohydrodynamic study of three-dimensional instability of the spontaneous fast magnetic reconnection. United States. https://doi.org/10.1063/1.3095562
Shimizu, T, Kondoh, K, Ugai, M, and Shibata, K. Fri . "Magnetohydrodynamic study of three-dimensional instability of the spontaneous fast magnetic reconnection". United States. https://doi.org/10.1063/1.3095562.
@article{osti_21277104,
title = {Magnetohydrodynamic study of three-dimensional instability of the spontaneous fast magnetic reconnection},
author = {Shimizu, T and Kondoh, K and Ugai, M and Shibata, K},
abstractNote = {Three-dimensional instability of the spontaneous fast magnetic reconnection is studied with magnetohydrodynamic (MHD) simulation, where the two-dimensional model of the spontaneous fast magnetic reconnection is destabilized in three dimension. Generally, in two-dimensional magnetic reconnection models, every plasma condition is assumed to be uniform in the sheet current direction. In such two-dimensional MHD simulations, the current sheet destabilized by the initial resistive disturbance can be developed to fast magnetic reconnection by a current driven anomalous resistivity. In this paper, the initial resistive disturbance includes a small amount of fluctuations in the sheet current direction, i.e., along the magnetic neutral line. The other conditions are the same as that of previous two-dimensional MHD studies for fast magnetic reconnection. Accordingly, we may expect that approximately two-dimensional fast magnetic reconnection occurs in the MHD simulation. In fact, the fast magnetic reconnection activated on the first stage of the simulation is two dimensional. However, on the subsequent stages, it spontaneously becomes three dimensional and is strongly localized in the sheet current direction. The resulting three-dimensional fast magnetic reconnection intermittently ejects three-dimensional magnetic loops. Such intermittent ejections of the three-dimensional loops are similar to the intermittent downflows observed in the solar flares. The ejection of the three-dimensional loops seems to be random but, numerically and theoretically, it is shown that the aspect ratio of the ejected loops is limited under a criterion.},
doi = {10.1063/1.3095562},
url = {https://www.osti.gov/biblio/21277104}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 16,
place = {United States},
year = {2009},
month = {5}
}