Dynamic Alignment in Driven Magnetohydrodynamic Turbulence

Abstract

Motivated by recent analytic predictions, we report numerical evidence showing that in driven incompressible magnetohydrodynamic turbulence the magnetic- and velocity-field fluctuations locally tend to align the directions of their polarizations. This dynamic alignment is stronger at smaller scales with the angular mismatch between the polarizations decreasing with the scale λapproximately as θ_λ~ λ^{1/4}. This can naturally lead to a weakening of the nonlinear interactions and provide an explanation for the energy spectrum E(k) ~ k^{-3/2} that is observed in numerical experiments of strongly magnetized turbulence.

4 pages, 2 figures, minor changes to match published version

References in corpus (8)

• Spectrum of magnetohydrodynamic turbulence
• The Anisotropy of MHD Alfvénic Turbulence
• Simulations of Incompressible MHD Turbulence
• Simulations of nonhelical hydromagnetic turbulence
• On the Spectrum of Magnetohydrodynamic Turbulence
• Spectral energy dynamics in magnetohydrodynamic turbulence
• Statistical anisotropy of magnetohydrodynamic turbulence
• Polarization intermittency in MHD and its influence on turbulent cascade

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