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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=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.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States); Caltech
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1574946
Alternate Identifier(s):
OSTI ID: 1355584; OSTI ID: 1355585; OSTI ID: 1361865
Grant/Contract Number:  
FG02-04ER54755
Resource Type:
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

Citation Formats

Yoon, Young Dae, and Bellan, Paul M. 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.
Yoon, Young Dae, & Bellan, Paul M. A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves. United States. https://doi.org/10.1063/1.4982812
Yoon, Young Dae, and Bellan, Paul M. Fri . "A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves". United States. https://doi.org/10.1063/1.4982812. https://www.osti.gov/servlets/purl/1574946.
@article{osti_1574946,
title = {A generalized two-fluid picture of non-driven collisionless reconnection and its relation to whistler waves},
author = {Yoon, Young Dae and Bellan, Paul M.},
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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Works referencing / citing this record:

An intuitive two-fluid picture of spontaneous 2D collisionless magnetic reconnection and whistler wave generation
journal, May 2018

  • Yoon, Young Dae; Bellan, Paul M.
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General connected and reconnected fields in plasmas
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The electron canonical battery effect in magnetic reconnection: Completion of the electron canonical vorticity framework
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Fast Ion Heating in Transient Collisionless Magnetic Reconnection via an Intrinsic Stochastic Mechanism
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