Cross-helicity and extended inertial range in MHD turbulence

TL;DR

This paper investigates the influence of cross-helicity on the inertial range in MHD turbulence, demonstrating agreement with simulations and measurements, and discussing symmetry breaking phenomena.

Contribution

It introduces the extended inertial range dominated by cross-helicity effects in MHD turbulence using the spatio-temporal chaos approach, validated by multiple data sources.

Findings

Good agreement with direct numerical simulations

Consistent results with laboratory and space measurements

Discussion of symmetry breaking in zero cross-helicity cases

Abstract

An extended inertial range dominated by the cross-helicity effects has been studied for forced (statistically steady) and for freely decaying magnetohydrodynamic MHD turbulence (with and without imposed/mean magnetic field) using the spatio-temporal distributed chaos approach. Good agreement with results of direct numerical simulations, laboratory measurements in MHD wind (plasma) tunnel, measurements in the Earth's magnetosheath and in the solar wind has been established. A spontaneous breaking of local reflection (mirror) symmetry has been briefly discussed for the MHD turbulence with zero average cross-helicity.