Magneto-inertial range dominated by magnetic helicity in space plasmas

TL;DR

This paper investigates the magneto-inertial range dominated by magnetic helicity across space and laboratory plasmas, combining simulations, observations, and theory to understand the transition from magnetohydrodynamics to kinetic regimes.

Contribution

It provides a comprehensive analysis of magnetic helicity dominance in the magneto-inertial range using diverse data and theoretical models, bridging different physical regimes and scales.

Findings

Numerical simulations agree quantitatively with observational data.

Magnetic helicity dominates the magneto-inertial range across various space environments.

Transition from MHD to kinetic regimes is characterized by specific spectral features.

Abstract

Magneto-inertial range dominated by magnetic helicity has been studied using results of numerical simulations, laboratory measurements, solar, solar wind, the Earth's and planets' magnetosphere observations (spacecraft measurements), and the global magnetic observatory network. The spectral data have been compared with the theoretical results based on the distributed chaos notion in the frames of the Kolmogorov-Iroshnikov phenomenology. The transition from magnetohydrodynamics to kinetics in the electron and Hall magnetohydrodynamics, and in a fully kinetic 3D approach, as well as in the solar wind, solar photosphere, and at the special events (reconnections, Kelvin-Helmholtz instability, isolated flux tube interchanges, etc.) in the magnetosphere of Earth, Saturn, Jupiter, and Mercury has been studied using the above-mentioned data. Despite the considerable differences in the physical parameters and scales, the results of numerical simulations are in quantitative agreement with the observational data in the frames of the magneto-inertial range notion. Temporal variability of the magnetic field at Earth's surface under the influence of the ionosphere, magnetosphere, and solar wind has been also briefly discussed in this context.