Helicity detection of the astrophysical magnetic fields from radio emission statistics

TL;DR

This paper proposes a method to detect the helicity of astrophysical magnetic fields by analyzing radio emission statistics, focusing on the correlation between Faraday rotation and polarization, sensitive to large-scale fields.

Contribution

It introduces a principal solution linking magnetic helicity to observable radio emission correlations, emphasizing the role of depolarization and frequency range.

Findings

Method effectively detects magnetic helicity in large-scale fields.

Depolarization significantly influences the detection capability.

Sensitivity is primarily to large-scale magnetic field components.

Abstract

We discuss inverse problem of detection turbulence magnetic field helical properties using radio survey observations statistics. In this paper, we present principal solution which connects magnetic helicity and correlation between Faraday rotation measure and polarization degree of radio synchrotron emission. The effect of depolarization plays the main role in this problem and allows to detect magnetic helicity for certain frequency range of observable radio emission. We show that the proposed method is mainly sensitive to a large-scale magnetic field component.