The Nonlinear Evolution of Instabilities Driven by Magnetic Buoyancy: A New Mechanism for the Formation of Coherent Magnetic Structures

Abstract

Motivated by the problem of the formation of active regions from a deep-seated solar magnetic field, we consider the nonlinear three-dimensional evolution of magnetic buoyancy instabilities resulting from a smoothly stratified horizontal magnetic field. By exploring the case for which the instability is continuously driven we have identified a new mechanism for the formation of concentrations of magnetic flux.

Published in ApJL. Version with colour figures

Cited by in corpus (11)

• Buoyant Magnetic Loops in a Global Dynamo Simulation of a Young Sun
• The negative effective magnetic pressure in stratified forced turbulence
• Active region formation through the negative effective magnetic pressure instability
• Alpha effect due to buoyancy instability of a magnetic layer
• Theoretical limits on magnetic field strengths in low-mass stars
• How can large-scale twisted magnetic structures naturally emerge from buoyancy instabilities?
• Interactions between magnetohydrodynamic shear instabilities and convective flows in the solar interior
• On the origin of the solar hemispherical helicity rules: Simulations of the rise of magnetic flux concentrations in a background field
• Generating buoyant magnetic flux ropes in solar-like convective dynamos
• Delayed Babcock-Leighton dynamos in the diffusion-dominated regime
• Shear-driven magnetic buoyancy in the solar tachocline: The mean electromotive force due to rotation