Turbulence and Dynamo Interlinks

TL;DR

This paper explores the complex relationship between turbulence and magnetic field generation in astrophysical environments, focusing on turbulent dynamo theories, collisionless-MHD effects in galaxy clusters, and magnetic reconnection.

Contribution

It provides a comprehensive overview of turbulent dynamo mechanisms, emphasizing the role of collisionless-MHD in intra-cluster media and linking turbulence with magnetic reconnection processes.

Findings

Collisionless-MHD significantly influences magnetic field amplification in galaxy clusters.

Turbulent dynamo theories explain magnetic field origin and maintenance in astrophysical plasmas.

Magnetic reconnection plays a role in magnetic flux diffusion during dynamo processes.

Abstract

The role of turbulence in astrophysical environments and its interplay with magnetic fields is still highly debated. In this lecture, we will discuss this issue in the framework of dynamo processes. We will first present a very brief summary of turbulent dynamo theories, then will focus on small scale turbulent dynamos and their particular relevance on the origin and maintenance of magnetic fields in the intra-cluster media (ICM) of galaxies. In these environments, the very low density of the flow requires a collisionless-MHD treatment. We will show the implications of this approach in the turbulent amplification of the magnetic fields in these environments. To finalize, we will also briefly address the connection between MHD turbulence and fast magnetic reconnection and its possible implications in the diffusion of magnetic flux in the dynamo process.