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Title: Role of the Plasmoid Instability in Magnetohydrodynamic Turbulence

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [1]
  1. Princeton Univ., Princeton, NJ (United States). Dept. of Astrophysical Sciences and Princeton Plasma Physics Lab.
  2. Princeton Univ., Princeton, NJ (United States). Dept. of Astrophysical Sciences and Princeton Plasma Physics Lab.; Columbia Univ., New York, NY (United States). Dept. of Astronomy and Columbia Astrophysics Lab.

The plasmoid instability in evolving current sheets has been widely studied due to its effects on the disruption of current sheets, the formation of plasmoids, and the resultant fast magnetic reconnection. In this Letter, we study the role of the plasmoid instability in two-dimensional magnetohydrodynamic (MHD) turbulence by means of high-resolution direct numerical simulations. At a sufficiently large magnetic Reynolds number (Rm = 106), the combined effects of dynamic alignment and turbulent intermittency lead to a copious formation of plasmoids in a multitude of intense current sheets. The disruption of current sheet structures facilitates the energy cascade towards small scales, leading to the breaking and steepening of the energy spectrum. In the plasmoid-mediated regime, the energy spectrum displays a scaling that is close to the spectral index –2.2 as proposed by recent analytic theories. In conclusion, we also demonstrate that the scale-dependent dynamic alignment exists in 2D MHD turbulence and the corresponding slope of the alignment angle is close to 0.25.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AGS-1338944; AGS-1460169; PHY-1229408; SC0016470; SC0006670; NNX13AK31G
OSTI ID:
1484228
Alternate ID(s):
OSTI ID: 1478600; OSTI ID: 1604343
Journal Information:
Physical Review Letters, Vol. 121, Issue 16; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (7)

Transition from ion-coupled to electron-only reconnection: Basic physics and implications for plasma turbulence journal August 2019
Scalings pertaining to current sheet disruption mediated by the plasmoid instability journal September 2019
Spectral signatures of recursive magnetic field reconnection journal November 2019
The Interplay of Magnetically Dominated Turbulence and Magnetic Reconnection in Producing Nonthermal Particles journal November 2019
Spectropolarimetric Insight into Plasma Sheet Dynamics of a Solar Flare journal December 2019
Spectral signatures of recursive magnetic field reconnection text January 2019
Scalings Pertaining to Current Sheet Disruption Mediated by the Plasmoid Instability text January 2019

Figures / Tables (5)


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