Disappearance of Anisotropic Intermittency in Large-amplitude MHD Turbulence and Its Comparison with Small-amplitude MHD Turbulence

Strong Anisotropic MHD Turbulence with Cross Helicity

This paper proposes a new phenomenology for strong incompressible MHD turbulence with nonzero cross helicity. This phenomenology is then developed into a quantitative Fokker-Planck model that describes the time evolution of the anisotropic power spectra of the fluctuations propagating parallel and anti-parallel to the background magnetic field B0. It is found that in steady state the power spec...

Energy transfers in anisotropic MHD turbulence

Density Fluctuations in MHD turbulence : spectra , intermittency and topology

We perform 3D compressible MHD simulations for an extended range of sonic and Alfvén Mach numbers and analyze the statistics of 3D density and 2D column density, which includes probability distribution functions, spectra, skewness, kurtosis, She-Lévêque exponents and genus. In order to establish the relation between the statistics of the observables, i.e. column densities, and the underlying 3D...

Intermittency in MHD turbulence and coronal nanoflares modelling

High resolution numerical simulations, solar wind data analysis, and measurements at the edges of laboratory plasma devices have allowed for a huge progress in our understanding of MHD turbulence. The high resolution of solar wind measurements has allowed to characterize the intermittency observed at small scales. We are now able to set up a consistent and convincing view of the main properties...

Small-scale intermittency in anisotropic turbulence.

Isotropic, rotating, and stratified turbulent flows are analyzed using a scale- and direction-dependent flatness. The anisotropy of the spatial fluctuations of the energy distribution can hereby be quantified for different length scales. This measure allows one to distinguish between longitudinal and transversal intermittency as well as between horizontal and vertical intermittency. The differe...