A Reconnecting Flux Rope Dynamo

TL;DR

This paper introduces a flux rope dynamo model where magnetic fields are confined in thin flux ropes, with dissipation through reconnection, showing higher efficiency in converting energy into heat and explaining solar corona heating.

Contribution

The paper presents a novel flux rope dynamo model that emphasizes reconnection-based dissipation and demonstrates its efficiency and relevance to solar phenomena.

Findings

Flux rope dynamo is an order of magnitude more efficient at converting energy into heat.

Magnetic energy release probability density follows a power-law with slope -3.

Model aligns with solar corona nanoflare heating observations.

Abstract

We develop a new model of the fluctuation dynamo in which the magnetic field is confined in thin flux ropes advected by a multi-scale flow modeling turbulence. Magnetic dissipation occurs only via reconnection of the flux ropes. We investigate the kinetic energy release into heat, mediated by the dynamo action, both in our model and by solving the induction equation with the same flow. We find that a flux rope dynamo is an order of magnitude more efficient at converting mechanical energy into heat. The probability density of the magnetic energy release in reconnections has a power-law form with the slope -3, consistent with the Solar corona heating by nanoflares.