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Extension of the electron dissipation region in collisionless Hall magnetohydrodynamics reconnection

Phys. Plasmas 16, 102111 (2009); doi:10.1063/1.3251423

Published 30 October 2009

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Brian P. Sullivan, A. Bhattacharjee, and Yi-Min Huang
Center for Integrated Computation and Analysis of Reconnection and Turbulence, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire 03824, USA
This paper presents Sweet–Parker type scaling arguments in the context of hyper-resistive Hall magnetohydrodynamics. Numerical experiments suggest that both cusplike and modestly more extended geometries are realizable. However, the length of the electron dissipation region, which is taken as a parameter by several recent studies, is found to depend explicitly on the level of hyper-resistivity. Furthermore, although hyper-resistivity can produce more extended electron dissipation regions, the length of the region remains smaller than one ion skin depth for the largest values of hyper-resistivity considered here, significantly shorter than current sheets seen in many recent kinetic studies. The length of the electron dissipation region is found to depend on electron inertia as well, scaling like (me/mi)3/8. However, the thickness of the region appears to scale similarly, so that the aspect ratio is at most very weakly dependent on (me/mi). ©2009 American Institute of Physics
History: Received 18 May 2009; accepted 30 September 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/102111/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.30.Cv
    Plasma magnetohydrodynamics
  • 52.35.Vd
    Magnetic reconnection in plasmas
  • YEAR: 2009

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ISSN:
1070-664X (print)   1089-7674 (online)
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