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Hydrodynamic and magnetohydrodynamic numerical studies of a mechanicallyforced two-vortex flow inside a sphere are reported. The simulations areperformed in the intermediate regime between the laminar flow and developedturbulence where a hydrodynamic instability is found to generate internal waveswith a characteristic m=2 zonal wave number. It is shown that thistime-periodic flow acts as a dynamo although snapshots of the flow as well asthe mean flow are not dynamos. The magnetic fields' growth rate exhibitsresonance effects depending on the wave frequency. Furthermore, a cyclicself-killing and self-recovering dynamo based on the relative alignment of thevelocity and magnetic fields is presented. The phenomena are explained in termsof a mixing of non-orthogonal eigenstates of the time dependent linear operatorof the magnetic induction equation. The potential relevance of this mechanismto dynamo experiments is discussed.

Wave-driven dynamo action in spherical MHD systems