Generation of magnetic fields by large-scale vortices in rotating convection

Abstract

We propose a new self-consistent dynamo mechanism for the generation of large-scale magnetic fields in natural objects. Recent computational studies have described the formation of large-scale vortices (LSVs) in rotating turbulent convection. Here we demonstrate that for magnetic Reynolds numbers below the threshold for small-scale dynamo action, such turbulent flows can sustain large-scale magnetic fields --- i.e. fields with a significant component on the scale of the system.

8 pages, 6 figures, accepted for publication in Physical Review E

References in corpus (2)

• Inverse cascade and symmetry breaking in rapidly-rotating Boussinesq convection
• Large-scale vortices in rapidly rotating Rayleigh-Bénard convection

Cited by in corpus (9)

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• Amplification of large-scale magnetic field in nonhelical magnetohydrodynamics
• Convection-driven kinematic dynamos at low Rossby and magnetic Prandtl numbers
• Magnetic fields driven by tidal mixing in radiative stars
• Jets and large-scale vortices in rotating Rayleigh-Bénard convection
• On the role of thermal boundary conditions in dynamo scaling laws
• Large-scale-vortex dynamos in planar rotating convection