Magnetic reconnection in two-dimensional magnetohydrodynamic turbulence.
Systematic analysis of numerical simulations of two-dimensional magnetohydrodynamic turbulence reveals the presence of a large number of X-type neutral points where magnetic reconnection occurs. We examine the statistical properties of this ensemble of reconnection events that are spontaneously generated by turbulence. The associated reconnection rates are distributed over a wide range of values and scales with the geometry of the diffusion region. Locally, these events can be described through a variant of the Sweet-Parker model, in which the parameters are externally controlled by turbulence. This new perspective on reconnection is relevant in space and astrophysical contexts, where plasma is generally in a fully turbulent regime.
Servidio
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Bartol Research Institute and Department of Physics, University of Delaware, Newark, Delaware 19716, USA.
Matthaeus
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Shay
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Cassak
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Dmitruk
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