2000 character limit reached
Fluctuation dynamo amplified by intermittent shear bursts in convectively driven magnetohydrodynamic turbulence (1304.0190v4)
Published 31 Mar 2013 in astro-ph.SR and physics.comp-ph
Abstract: Intermittent large-scale high-shear flows are found to occur frequently and spontaneously in direct numerical simulations of statistically stationary turbulent Boussinesq magnetohydrodynamic (MHD) convection. The energetic steady-state of the system is sustained by convective driving of the velocity field and small-scale dynamo action. The intermittent emergence of flow structures with strong velocity and magnetic shearing generates magnetic energy at an elevated rate over time-scales longer than the characteristic time of the large-scale convective motion. The resilience of magnetic energy amplification suggests that intermittent shear-bursts are a significant driver of dynamo action in turbulent magnetoconvection.