Parker's dynamo and geomagnetic reversals

TL;DR

This paper investigates how small fluctuations in the alpha-effect influence hemispherical magnetic field asymmetry and dynamo wave propagation in Parker's dynamo, offering insights into geodynamo regimes.

Contribution

It demonstrates that minor fluctuations can cause significant hemispherical asymmetry and explores how dynamo number variations explain different magnetic field regimes.

Findings

Small fluctuations induce hemispherical magnetic asymmetry.

Dynamo wave can propagate across the equator due to fluctuations.

Changing the dynamo number explains various geodynamo regimes.

Abstract

Fluctuations of the alpha-effect which break equatorial symmetry of the flow in the kinematic Parker's dynamo are considered. We show, that even small (a few percents) fluctuation can leed to the substantial assymmetry of the magnetic field in the hemispheres as well as the propagation of the dynamo wave through the equator plane. We also consider how change of the dynamo number can be used to explain different regimes of magnetic field generation in geodynamo.