Role of Magnetic Reconnection in Magnetohydrodynamic Turbulence
Journal Article
·
· Physical Review Letters
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; MIT
- 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:
- National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- SC0016215
- OSTI ID:
- 1505742
- Alternate ID(s):
- OSTI ID: 1364209
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 118; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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