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Reconnection from a turbulence perspective

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Title: Reconnection from a turbulence perspective
Authors: Adhikari, S
Shay, MA
Parashar, TN
Pyakurel, PS
Matthaeus, WH
Godzieba, D
Stawarz, JE
Eastwood, JP
Dahlin, JT
Item Type: Journal Article
Abstract: The spectral properties associated with laminar, anti-parallel reconnection are examined using a 2.5D kinetic particle in cell simulation. Both the reconnection rate and the energy spectrum exhibit three distinct phases: an initiation phase where the reconnection rate grows, a quasi-steady phase, and a declining phase where both the reconnection rate and the energy spectrum decrease. During the steady phase, the energy spectrum exhibits approximately a double power law behavior, with a slope near −5/3 at wave numbers smaller than the inverse ion inertial length and a slope steeper than −8/3 for larger wave numbers up to the inverse electron inertial length. This behavior is consistent with a Kolmogorov energy cascade and implies that laminar reconnection may fundamentally be an energy cascade process. Consistent with this idea is the fact that the reconnection rate exhibits a rough correlation with the energy spectrum at wave numbers near the inverse ion inertial length. The 2D spectrum is strongly anisotropic with most energy associated with the wave vector direction normal to the current sheet. Reconnection acts to isotropize the energy spectrum, reducing the Shebalin angle from an initial value of 70° to about 48° (nearly isotropic) by the end of the simulation. The distribution of energy over length scales is further analyzed by dividing the domain into spatial subregions and employing structure functions.
Issue Date: 1-Apr-2020
Date of Acceptance: 1-Mar-2020
URI: http://hdl.handle.net/10044/1/79456
DOI: 10.1063/1.5128376
ISSN: 1070-664X
Publisher: AIP Publishing
Start Page: 1
End Page: 10
Journal / Book Title: Physics of Plasmas
Volume: 27
Issue: 4
Copyright Statement: © 2020 Author(s).
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/N000692/1
ST/S000364/1
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
SOLAR-WIND TURBULENCE
MAGNETIC RECONNECTION
CASCADE
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
SOLAR-WIND TURBULENCE
MAGNETIC RECONNECTION
CASCADE
physics.plasm-ph
physics.plasm-ph
physics.space-ph
Fluids & Plasmas
0201 Astronomical and Space Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0203 Classical Physics
Publication Status: Published
Online Publication Date: 2020-04-09
Appears in Collections:Space and Atmospheric Physics
Physics



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