3D Hall MHD Modeling of Solar Wind Plasma Spectra

TL;DR

This paper presents 3D Hall MHD simulations of solar wind plasma, revealing spectral features like a $k^{-7/3}$ spectrum at small scales and exploring scale-dependent anisotropy driven by nonlinear processes.

Contribution

It introduces fully self-consistent 3D simulations of compressible Hall MHD that capture spectral features and anisotropy relevant to solar wind plasma.

Findings

Identification of a $k^{-7/3}$ spectral regime at sub-ion scales

Analysis of scale-dependent anisotropy in solar wind turbulence

Insights into wave and nonlinear cascade roles in solar wind evolution

Abstract

We present fully self consistent 3D simulations of compressible Hall MHD plasma that describe spectral features relevant to the solar wind plasma. We find that a $k^{-7/3}$ spectrum sets in for the fluctuations that are smaller than ion gyro radius. We further investigate scale dependent anisotropy led by nonlinear processes relevant to the solar wind plasma. Our work is important particularly in understanding the role of wave and nonlinear cascades in the evolution of the solar wind, structure formation at the largest scales.