From reversing to hemispherical dynamos

Abstract

We show that hemispherical dynamos can result from weak equatorial symmetry breaking of the flow in the interior of planets and stars. Using a model of spherical dynamo, we observe that the interaction between a dipolar and a quadrupolar mode can localize the magnetic field in only one hemisphere when the equatorial symmetry is broken. This process is shown to be related to the one that is responsible for reversals of the magnetic field. These seemingly very different behaviors are thus understood in a unified framework.

References in corpus (2)

• A simple mechanism for the reversals of Earth's magnetic field
• A numerical model of the VKS experiment

Cited by in corpus (10)

• Solar Magnetic Field Reversals and the Role of Dynamo Families
• Grand Minima and Equatorward Propagation in a Cycling Stellar Convective Dynamo
• Reversals of a large scale field generated over a turbulent background
• Convective dynamo action in a spherical shell: symmetries and modulation
• Bistability between equatorial and axial dipoles during magnetic field reversals
• Numerical simulations of the Tayler-Spruit dynamo in proto-magnetars
• Dipole-Quadrupole dynamics during magnetic field reversals
• Convection and dynamo action in B stars
• Energy Fluxes during Dynamo Reversals
• Spectral properties of oscillatory and non-oscillatory α^2-dynamos