Statistical anisotropy of magnetohydrodynamic turbulence

Details Statistical anisotropy of magnetohydrodynamic turbulence Statistical anisotropy of magnetohydrodynamic turbulence

2003-06-05

arxiv.org/abs/physics/0306045v1

Physics

Plasma Physics

4 pages, 3 figures. To appear in Phys.Rev.E

Scientific paper

10.1103/PhysRevE.67.066302

Direct numerical simulations of decaying and forced magnetohydrodynamic (MHD) turbulence without and with mean magnetic field are analyzed by higher-order two-point statistics. The turbulence exhibits statistical anisotropy with respect to the direction of the local magnetic field even in the case of global isotropy. A mean magnetic field reduces the parallel-field dynamics while in the perpendicular direction a gradual transition towards two-dimensional MHD turbulence is observed with $k^{-3/2}$ inertial-range scaling of the perpendicular energy spectrum. An intermittency model based on the Log-Poisson approach, $\zeta_p=p/g^2 +1 -(1/g)^{p/g}$, is able to describe the observed structure function scalings.

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