Magnetohydrodynamic study of threedimensional instability of the spontaneous fast magnetic reconnection
Abstract
Threedimensional instability of the spontaneous fast magnetic reconnection is studied with magnetohydrodynamic (MHD) simulation, where the twodimensional model of the spontaneous fast magnetic reconnection is destabilized in three dimension. Generally, in twodimensional magnetic reconnection models, every plasma condition is assumed to be uniform in the sheet current direction. In such twodimensional 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 twodimensional MHD studies for fast magnetic reconnection. Accordingly, we may expect that approximately twodimensional 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 threedimensional fast magnetic reconnection intermittently ejects threedimensional magnetic loops. Such intermittent ejections of the threedimensional loops are similar to the intermittent downflows observed in the solar flares. The ejection of themore »
 Authors:

 Department of Computer Science, Ehime University, Matsuyama City 7908577 (Japan)
 Kwasan Observatory, Graduate School of Science, Kyoto University, Kyoto City 6078471 (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 1070664X
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FLUCTUATIONS; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA INSTABILITY; PLASMA SIMULATION; THREEDIMENSIONAL CALCULATIONS; TWODIMENSIONAL CALCULATIONS
Citation Formats
Shimizu, T, Kondoh, K, Ugai, M, and Shibata, K. Magnetohydrodynamic study of threedimensional 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 threedimensional 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 threedimensional instability of the spontaneous fast magnetic reconnection". United States. https://doi.org/10.1063/1.3095562.
@article{osti_21277104,
title = {Magnetohydrodynamic study of threedimensional instability of the spontaneous fast magnetic reconnection},
author = {Shimizu, T and Kondoh, K and Ugai, M and Shibata, K},
abstractNote = {Threedimensional instability of the spontaneous fast magnetic reconnection is studied with magnetohydrodynamic (MHD) simulation, where the twodimensional model of the spontaneous fast magnetic reconnection is destabilized in three dimension. Generally, in twodimensional magnetic reconnection models, every plasma condition is assumed to be uniform in the sheet current direction. In such twodimensional 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 twodimensional MHD studies for fast magnetic reconnection. Accordingly, we may expect that approximately twodimensional 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 threedimensional fast magnetic reconnection intermittently ejects threedimensional magnetic loops. Such intermittent ejections of the threedimensional loops are similar to the intermittent downflows observed in the solar flares. The ejection of the threedimensional 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 = {1070664X},
number = 5,
volume = 16,
place = {United States},
year = {2009},
month = {5}
}