Title

Electron magnetohydrodynamic turbulence: universal features

Authors

Authors

B. K. Shivamoggi

Comments

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Abbreviated Journal Title

Eur. Phys. J. D

Keywords

FULLY-DEVELOPED TURBULENCE; ENERGY-DISSIPATION RATE; STATISTICAL-MECHANICS; SPATIAL INTERMITTENCY; ISOTROPIC TURBULENCE; SINGULARITIES; DIMENSIONS; FLUID; Optics; Physics, Atomic, Molecular & Chemical

Abstract

The energy cascade of electron magnetohydrodynamic (EMHD) turbulence is considered. Fractal and multi-fractal models for the energy dissipation field are used to determine the spatial intermittency corrections to the scaling behavior in the high-wavenumber (electron hydrodynamic limit) and low-wavenumber (magnetization limit) asymptotic regimes of the inertial range. Extrapolation of the multi-fractal scaling down to the dissipative microscales confirms in these asymptotic regimes a dissipative anomaly previously indicated by the numerical simulations of EMHD turbulence. Several basic features of the EMHD turbulent system are found to be universal which seem to transcend the existence of the characteristic length scale de (which is the electron skin depth) in the EMHD problem: equipartition spectrum; Reynolds-number scaling of the dissipative microscales; scaling of the probability distribution function (PDF) of the electron-flow velocity (or magnetic field) gradient (even with intermittency corrections); dissipative anomaly; and critical exponent scaling.

Journal Title

European Physical Journal D

Volume

69

Issue/Number

2

Publication Date

1-1-2015

Document Type

Article

Language

English

First Page

10

WOS Identifier

WOS:000353819300003

ISSN

1434-6060

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