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Role of Magnetic Reconnection in Magnetohydrodynamic Turbulence

Loureiro, Nuno F ; Boldyrev, Stanislav

Physical review letters, 2017-06, Vol.118 (24), p.245101-245101, Article 245101 [Periódico revisado por pares]

United States: American Physical Society (APS)

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  • Título:
    Role of Magnetic Reconnection in Magnetohydrodynamic Turbulence
  • Autor: Loureiro, Nuno F ; Boldyrev, Stanislav
  • Assuntos: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
  • É parte de: Physical review letters, 2017-06, Vol.118 (24), p.245101-245101, Article 245101
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    USDOE
    SC0016215; NSF AGS-1261659
    National Science Foundation (NSF)
  • Descrição: 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. We analyze the role of magnetic reconnection in these structures and conclude that reconnection becomes important at a scale λ∼LS_{L}^{-4/7}, where S_{L} 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}, 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_{L}^{-4/7}Pm^{-2/7}.
  • Editor: United States: American Physical Society (APS)
  • Idioma: Inglês
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