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A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves

Yoon, Young Dae and Bellan, Paul M. (2017) A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves. Physics of Plasmas, 24 (5). Art. No. 052114. ISSN 1070-664X. https://resolver.caltech.edu/CaltechAUTHORS:20170505-134431772

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Abstract

A generalized, intuitive two-fluid picture of 2D non-driven collisionless magnetic reconnection is described using results from a full-3D numerical simulation. The relevant two-fluid equations simplify to the condition that the flux associated with canonical circulation Q=m_e ∇ × u_e + q_e B is perfectly frozen into the electron fluid. In the reconnection geometry, flux tubes defined by Q are convected with the central electron current, effectively stretching the tubes and increasing the magnitude of Q exponentially. This, coupled with the fact that Q is a sum of two quantities, explains how the magnetic fields in the reconnection region reconnect and give rise to strong electron acceleration. The Q motion provides an interpretation for other phenomena as well, such as spiked central electron current filaments. The simulated reconnection rate was found to agree with a previous analytical calculation having the same geometry. Energy analysis shows that the magnetic energy is converted and propagated mainly in the form of the Poynting flux, and helicity analysis shows that the canonical helicity ∫P·Q dV as a whole must be considered when analyzing reconnection. A mechanism for whistler wave generation and propagation is also described, with comparisons to recent spacecraft observations.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.4982812DOIArticle
http://aip.scitation.org/doi/10.1063/1.4982812PublisherArticle
ORCID:
AuthorORCID
Yoon, Young Dae0000-0001-8394-2076
Bellan, Paul M.0000-0002-0886-8782
Additional Information:© 2017 Published by AIP Publishing. Received 17 February 2017; accepted 19 April 2017; published online 5 May 2017. This material is based upon work supported by the National Science Foundation under Award No. 1059519, by the Air Force Office of Scientific Research under Award No. FA9550-11-1-0184, and by the U.S. Department of Energy Office of Science, Office of Fusion Energy Sciences under Award No. DE-FG02-04ER54755.
Funders:
Funding AgencyGrant Number
NSFAGS-1059519
Air Force Office of Scientific Research (AFOSR)FA9550-11-1-0184
Department of Energy (DOE)DE-FG02-04ER54755
Issue or Number:5
Record Number:CaltechAUTHORS:20170505-134431772
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170505-134431772
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77232
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 May 2017 21:07
Last Modified:09 Mar 2020 13:19

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