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Structure of the dissipation region in fluid simulations of asymmetric magnetic reconnection

Phys. Plasmas 16, 055704 (2009); doi:10.1063/1.3086867

Published 24 March 2009

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P. A. Cassak1 and M. A. Shay2
1Department of Physics, West Virginia University, Morgantown, West Virginia 26506, USA
2Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
The structure of the dissipation region during asymmetric magnetic reconnection is studied assuming antiparallel magnetic fields in two dimensions. A physics-based prediction for the scaling of the thickness of the dissipation region in (collisionless) Hall reconnection is presented and confirmed with two-fluid simulations. However, the substructure of the dissipation region in these and additional single-fluid (magnetohydrodynamics) simulations disagrees with a recent model [Cassak and Shay, Phys. Plasmas 14, 102114 (2007)]. We attribute the disagreement to the lack of plasma mixing along newly reconnected field lines in fluid models, rendering the use of a fluid description of questionable validity for determining the dissipation region substructure. Applications to the dayside magnetopause are discussed. ©2009 American Institute of Physics
History: Received 7 December 2008; accepted 2 February 2009; published 24 March 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/055704/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.30.Cv
    Plasma magnetohydrodynamics
  • 94.30.cp
    Magnetic reconnection in the magnetosphere
  • 94.30.ch
    Magnetopause
  • YEAR: 2009

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