Fast magnetic reconnection due to anisotropic electron pressure

P. A. Cassak, R. N. Baylor, R. L. Fermo, M. T. Beidler, M. A. Shay, M. Swisdak, J. F. Drake, H. Karimabadi

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A new regime of fast magnetic reconnection with an out-of-plane (guide) magnetic field is reported in which the key role is played by an electron pressure anisotropy described by the Chew-Goldberger-Low gyrotropic equations of state in the generalized Ohm's law, which even dominates the Hall term. A description of the physical cause of this behavior is provided and two-dimensional fluid simulations are used to confirm the results. The electron pressure anisotropy causes the out-of-plane magnetic field to develop a quadrupole structure of opposite polarity to the Hall magnetic field and gives rise to dispersive waves. In addition to being important for understanding what causes reconnection to be fast, this mechanism should dominate in plasmas with low plasma beta and a high in-plane plasma beta with electron temperature comparable to or larger than ion temperature, so it could be relevant in the solar wind and some tokamaks.

Original languageEnglish
Article number020705
JournalPhysics of Plasmas
Volume22
Issue number2
DOIs
StatePublished - Feb 1 2015
Externally publishedYes

Funding

FundersFunder number
National Aeronautics and Space AdministrationNNX10AN08A, NNX14AF42G, NNX14AC78G, NNX11AD69G
National Stroke FoundationAGS-0953463
National Science Foundation
Directorate for Geosciences0953463

    Fingerprint

    Dive into the research topics of 'Fast magnetic reconnection due to anisotropic electron pressure'. Together they form a unique fingerprint.

    Cite this