Influence of Stationary Local Mean Field on the Scaling Anisotropy in MHD 1 Turbulence

However, the thus reconstructed parallel spectrum can be contaminated by intermittent events and nonparallel fluctuations. In this work, we simulate the driven compressible MHD turbulence to investigate the influence of the stationary local mean field on the scaling anisotropy.

By examining whether the local parallel samplings are along the magnetic field directions, we confirm that the stationary local mean field can be fulfilled by the criterion ϕ < 10◦ with ϕ being the angle between the two local mean magnetic fields after cutting the sampled magnetic field intervals into two halves. The three-dimensional (3D) numerical data also show that the samplings with the stationary local mean fields successfully prevent intermittency events and nonparallel fluctuations from mixing into the measured parallel fluctuations.