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Title: Scaling of asymmetric reconnection in compressible plasmas

Abstract

The scaling of the reconnection rate with external parameters is reconsidered for antiparallel reconnection in a single-fluid magnetohydrodynamic (MHD) model, allowing for compressibility as well as asymmetry between the plasmas and magnetic fields in the two inflow regions. The results show a modest dependence of the reconnection rate on the plasma beta (ratio of plasma to magnetic pressure) in the inflow regions and demonstrate the importance of the conversion of magnetic energy to enthalpy flux (that is, convected thermal energy) in the outflow regions. The conversion of incoming magnetic to outgoing thermal energy flux remains finite even in the limit of incompressibility, while the scaling of the reconnection rate obtained earlier [P. A. Cassak and M. A. Shay, Phys. Plasmas 14, 102114 (2007)] is recovered. The assumptions entering the scaling estimates are critically investigated on the basis of two-dimensional resistive MHD simulations, confirming and even strengthening the importance of the enthalpy flux in the outflow from the reconnection site.

Authors:
;  [1];  [2];  [3]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771 (United States)
  3. Ruhr University, D-44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
21371101
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 17; Journal Issue: 5; Other Information: DOI: 10.1063/1.3429676; (c) 2010 American Institute of Physics; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; BETA RATIO; COMPRESSIBILITY; ENTHALPY; MAGNETIC FIELDS; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA SIMULATION; SCALING; TWO-DIMENSIONAL CALCULATIONS; DIMENSIONLESS NUMBERS; FLUID MECHANICS; HYDRODYNAMICS; MECHANICAL PROPERTIES; MECHANICS; PHYSICAL PROPERTIES; SIMULATION; THERMODYNAMIC PROPERTIES

Citation Formats

Birn, J, Borovsky, J E, Hesse, M, and Schindler, K. Scaling of asymmetric reconnection in compressible plasmas. United States: N. p., 2010. Web. doi:10.1063/1.3429676.
Birn, J, Borovsky, J E, Hesse, M, & Schindler, K. Scaling of asymmetric reconnection in compressible plasmas. United States. https://doi.org/10.1063/1.3429676
Birn, J, Borovsky, J E, Hesse, M, and Schindler, K. Sat . "Scaling of asymmetric reconnection in compressible plasmas". United States. https://doi.org/10.1063/1.3429676.
@article{osti_21371101,
title = {Scaling of asymmetric reconnection in compressible plasmas},
author = {Birn, J and Borovsky, J E and Hesse, M and Schindler, K},
abstractNote = {The scaling of the reconnection rate with external parameters is reconsidered for antiparallel reconnection in a single-fluid magnetohydrodynamic (MHD) model, allowing for compressibility as well as asymmetry between the plasmas and magnetic fields in the two inflow regions. The results show a modest dependence of the reconnection rate on the plasma beta (ratio of plasma to magnetic pressure) in the inflow regions and demonstrate the importance of the conversion of magnetic energy to enthalpy flux (that is, convected thermal energy) in the outflow regions. The conversion of incoming magnetic to outgoing thermal energy flux remains finite even in the limit of incompressibility, while the scaling of the reconnection rate obtained earlier [P. A. Cassak and M. A. Shay, Phys. Plasmas 14, 102114 (2007)] is recovered. The assumptions entering the scaling estimates are critically investigated on the basis of two-dimensional resistive MHD simulations, confirming and even strengthening the importance of the enthalpy flux in the outflow from the reconnection site.},
doi = {10.1063/1.3429676},
url = {https://www.osti.gov/biblio/21371101}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 17,
place = {United States},
year = {2010},
month = {5}
}