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

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 eB 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.

Authors:
Publication Date:
Research Org.:
Caltech; California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1355585
Alternate Identifier(s):
OSTI ID: 1355584; OSTI ID: 1361865
Grant/Contract Number:
FG02-04ER54755
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Magnetic Reconnection; Magnetic Fields; Whistler Waves; Quadrupole; Convection Currents; magnetic reconnection; magnetic fields; whistler waves; quadrupole; convection currents

Citation Formats

None, None. A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves. United States: N. p., 2017. Web. doi:10.1063/1.4982812.
None, None. A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves. United States. doi:10.1063/1.4982812.
None, None. Fri . "A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves". United States. doi:10.1063/1.4982812. https://www.osti.gov/servlets/purl/1355585.
@article{osti_1355585,
title = {A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves},
author = {None, None},
abstractNote = {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=me∇×ue+qeB 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.},
doi = {10.1063/1.4982812},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Fri May 05 00:00:00 EDT 2017},
month = {Fri May 05 00:00:00 EDT 2017}
}

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