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Torsional magnetic reconnection at three dimensional null points: A phenomenological study

Wyper, P. and Jain, R. (2010) Torsional magnetic reconnection at three dimensional null points: A phenomenological study. Physics of Plasmas, 17 (9). Art no.092902 . ISSN 1070-664X

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Abstract

Magnetic reconnection around three dimensional (3D) magnetic null points is the natural progression from X-point reconnection in two dimensions. In 3D the separator field lines of the X-point are replaced with the spine line and fan plane (the field lines which asymptotically approach or recede from the null). In this work analytical models are developed for the newly classified torsional spine and torsional fan reconnection regimes by solving the steady state, kinematic, resistive magnetohydrodynamic equations. Reconnection is localized to around the null through the use of a localized field perturbation leading to a localized current while a constant resistivity is assumed. For the torsional spine case current is found to localize around the spine leading to a spiraling slippage of the field around the spine and out along the fan. For the torsional fan case current is found to be localized to the fan plane leading again to a spiraling slippage of the field. In each case no flux is transported across either the spine or the fan. An intermediate twist is then introduced and a link is established between the two regimes. We find that for a general twist plasma flows associated with both torsional spine and fan appear in distinct regions. As such we suggest that the "pure" flows of each are extreme cases. (C) 2010 American Institute of Physics. [doi:10.1063/1.3480639]

Item Type: Article
Copyright, Publisher and Additional Information: © 2010 American Institute of Physics. This is an author produced version of a paper subsequently published in Physics of Plasmas. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: magnetic reconnection; plasma magnetohydrodynamics; plasma transport processes
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 12 Nov 2010 10:20
Last Modified: 08 Feb 2013 17:29
Published Version: http://dx.doi.org/10.1063/1.3480639
Status: Published
Publisher: American Institute of Physics
Refereed: Yes
Identification Number: 10.1063/1.3480639
URI: http://eprints.whiterose.ac.uk/id/eprint/42627

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