Scale-dependent analysis of angular momentum flux in high-resolution magnetohydrodynamic simulations for solar differential rotation

TL;DR

This study uses high-resolution MHD simulations to analyze how magnetic angular momentum transport varies with spatial scale, revealing that small-scale magnetic fields dominate the transport process in solar-like differential rotation.

Contribution

It provides a detailed scale-dependent analysis of magnetic angular momentum transport in high-resolution simulations, highlighting the role of small-scale magnetic fields without artificial manipulations.

Findings

Turbulence transports angular momentum inward, especially at higher resolutions.

Smallest spatial scales dominate magnetic angular momentum transport.

High-resolution simulations show low magnetic correlation, indicating chaotic small-scale magnetic fields are effective.

Abstract

In this work, we systematically investigate the scale-dependent angular momentum flux by analysing high-resolution three-dimensional magnetohydrodynamic simulations in which the solar-like differential rotation is reproduced without using any manipulations. More specifically, the magnetic angular momentum transport (AMT) plays a dominant role in the calculations. We examine the important spatial scales for the magnetic AMT. The main conclusions of our approach can be summarized as follows: 1. Turbulence transports the angular momentum radially inward. This effect is more pronounced in the highest resolution calculation. 2. The dominant scale for the magnetic AMT is the smallest spatial scale. 3. The dimensionless magnetic correlation is low in the high-resolution simulation. Thus, chaotic but strong small-scale magnetic fields achieve efficient magnetic AMT.