Rapid directional alignment of velocity and magnetic field in magnetohydrodynamic turbulence

Details Rapid directional alignment of velocity and magnetic field in magnetohydrodynamic turbulence Rapid directional alignment of velocity and magnetic field in magnetohydrodynamic turbulence

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh31b..05m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH31B-05

Physics

2149 Mhd Waves And Turbulence (2752, 6050, 7836), 7863 Turbulence (4490)

Scientific paper

We show that local directional alignment of the velocity and magnetic field fluctuations occurs rapidly in magnetohydrodynamics for a variety of parameters. The phenomenon, which occurs within an eddy turnover time regardless of the initial alignment of the fluctuations, is observed both in direct numerical simulations and in solar wind data. The phenomenon is due to either pressure gradients or shear-associated kinetic energy gradients acting along the magnetic field. A similar alignment, of velocity and vorticity, occurs in the Navier Stokes fluid case. This may be the most rapid and robust relaxation process in turbulent flows, and leads to a local weakening of the nonlinear terms in the small scale vorticity and current structures where alignment takes place.

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