RädlerFest: Alpha Effect and Beyond

Session

Session 8

15 Feb 2011, 16:00

Wenner-Gren Center, floor 7, Hörsalen (Wenner Gren Center)

270. Test methods for hydro and MHD turbulence

Dr Matthias Reinhard

15/02/2011, 16:00

Examples with purely magnetic as well as MHD backgrounds are studied where the quasi-kinematic test-field method breaks down. In cases with homogeneous mean fields it is shown that the generalized method produces the same results as the imposed-field method, where the field-aligned component of the actual electromotive force from the simulation is used. For MHD backgrounds, new...

271. Transition from large-scale to small-scale dynamo

Dr Frank Plunian

15/02/2011, 17:00

The dynamo equations are solved numerically with a helical forcing corresponding to the Roberts flow. In the fully turbulent regime the flow behaves as a Roberts flow on long time scales, plus turbulent fluctuations at short time scales. The dynamo onset is controlled by the long time scales of the flow, in agreement with the former Karlsruhe experimental results. The dynamo mechanism is...