Rapid alignment of velocity and magnetic field in magnetohydrodynamic turbulence.

  title={Rapid alignment of velocity and magnetic field in magnetohydrodynamic turbulence.},
  author={W. H. Matthaeus and Annick Pouquet and Pablo D. Mininni and P. Dmitruk and Ben Breech},
  journal={Physical review letters},
  volume={100 8},
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… CONTINUE READING

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