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Updated: Jul 6, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Rapid alignment of velocity and magnetic field in magnetohydrodynamic turbulence
W H Matthaeus1, A Pouquet, P D Mininni
1Department of Physics and Astronomy, University of Delaware, Newark, Delaware 18716, USA.
Abstract:
We show that local directional alignment of the velocity and magnetic field fluctuations occurs rapidly in magnetohydrodynamics for a variety of parameters and is seen both in direct numerical simulations and in solar wind data. The phenomenon is due to an alignment between magnetic field and gradients of either pressure or kinetic energy, and is similar to alignment of velocity and vorticity in Navier-Stokes turbulence. This rapid and robust relaxation process leads to a local weakening of nonlinear terms.
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