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Title: Role of Magnetic Reconnection in Magnetohydrodynamic Turbulence

Journal Article · · Physical Review Letters
 [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  2. Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics; Space Science Inst., Boulder, Co (United States)

The current understanding of magnetohydrodynamic (MHD) turbulence envisions turbulent eddies which are anisotropic in all three directions. In the plane perpendicular to the local mean magnetic field, this implies that such eddies become current-sheetlike structures at small scales. Here, we analyze the role of magnetic reconnection in these structures and conclude that reconnection becomes important at a scale λ ~ LS$$- 4/7\atop{L}$$, where SL is the outer-scale (L) Lundquist number and λ is the smallest of the field-perpendicular eddy dimensions. This scale is larger than the scale set by the resistive diffusion of eddies, therefore implying a fundamentally different route to energy dissipation than that predicted by the Kolmogorov-like phenomenology. In particular, our analysis predicts the existence of the subinertial, reconnection interval of MHD turbulence, with the estimated scaling of the Fourier energy spectrum E (k ) ∝ k $$- 5/2\atop{⊥}$$, where k is the wave number perpendicular to the local mean magnetic field. The same calculation is also performed for high (perpendicular) magnetic Prandtl number plasmas (Pm), where the reconnection scale is found to be λ / L ~ S$$- 4/7\atop{L}$$ Pm -2/7.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
SC0016215; NSF AGS-1261659
OSTI ID:
1505742
Alternate ID(s):
OSTI ID: 1364209
Journal Information:
Physical Review Letters, Vol. 118, Issue 24; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Cited By (21)

The multi-scale nature of the solar wind journal December 2019
Onset of fast “ideal” tearing in thin current sheets: Dependence on the equilibrium current profile journal March 2018
On the Hall-mediated resistive tearing instability of highly elongated current sheets journal January 2019
Scalings pertaining to current sheet disruption mediated by the plasmoid instability journal September 2019
3D turbulent reconnection: Theory, tests, and astrophysical implications journal January 2020
Spectral signatures of recursive magnetic field reconnection journal November 2019
3D Anisotropy of Solar Wind Turbulence, Tubes, or Ribbons? journal January 2018
Magnetohydrodynamic Turbulence in the Plasmoid-mediated Regime journal February 2018
Stochastic Reconnection for Large Magnetic Prandtl Numbers journal June 2018
Large-scale Compression Acceleration during Magnetic Reconnection in a Low- β Plasma journal October 2018
Numerical Study of Inertial Kinetic-Alfvén Turbulence journal January 2019
Relativistic Tearing Mode in Pair Plasmas and Application to Magnetic Giant Flares journal July 2019
The Interplay of Magnetically Dominated Turbulence and Magnetic Reconnection in Producing Nonthermal Particles journal November 2019
Turbulence in Magnetized Pair Plasmas journal October 2018
Properties of the Turbulence Associated with Electron-only Magnetic Reconnection in Earth’s Magnetosheath journal June 2019
Magnetohydrodynamic Turbulence in the Plasmoid-Mediated Regime text January 2018
Role of the Plasmoid Instability in Magnetohydrodynamic Turbulence text January 2018
On the Hall-mediated resistive tearing instability of highly elongated current sheets preprint January 2018
Spectral signatures of recursive magnetic field reconnection text January 2019
Scalings Pertaining to Current Sheet Disruption Mediated by the Plasmoid Instability text January 2019
3D Turbulent Reconnection: Theory, Tests and Astrophysical Implications text January 2020

Figures / Tables (1)


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