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Magnetic structures in a dynamo simulationBy

We use three-dimensional simulations to study compressible convection in a rotating frame with magnetic elds and overshoot into surrounding stable layers. The, initially weak, magnetic eld is ampliied and maintained by dynamo action and becomes or-ganised into ux tubes that are wrapped around vortex tubes. We also observe vortex buoyancy which causes upward ows in the cores of extended downdrafts. An analysis of the angles between various vector elds shows that there is a tendency for the magnetic eld to be parallel or antiparallel to the vorticity vector, especially when the magnetic eld is strong. The magnetic energy spectrum has a short inertial range with a slope compatible with k +1=3 during the early growth phase of the dynamo. During the saturated state the slope is compatible with k ?1. A simple analysis based on various characteristic timescales and energy transfer rates highlights important qualitative ideas regarding the energy budget of hydromagnetic dynamos.