RädlerFest: Alpha Effect and Beyond

Session

Session 9

16 Feb 2011, 09:00

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

272. Oscillating α2 dynamos

Dr Andre Giesecke

16/02/2011, 09:00

A simple way to interpret the reversal mechanism of the Earth's magnetic field has been achieved in theoretical models based on the interplay between very few magnetic modes. Motivated by the temporal behavior of elementary multipolar components of the Earth's magnetic field during the last reversal 780ka ago, (Leonhardt & Fabian 2007) the possibility of interacting magnetic modes is...

273. α2 dynamo with oscillations and migrations

Dhrubaditya Mitra

16/02/2011, 09:30

We present direct numerical simulations with helical forcing in spherical coordinates which generates a dynamo which shows oscillations and equatorward migration. This DNS can be described by a mean field model with an alpha square dynamo where the alpha has different signs on the two hemispheres.

274. Oscillatory dynamo models and implications for the solar dynamo

Dr Martin Schrinner

16/02/2011, 10:00

Under which conditions are convection-driven dynamo models oscillatory and do these models provide any implications for the solar dynamo? We perform global direct numerical simulations varying the governing parameters as well as the mechanical boundary conditions and build a sample of oscillatory dynamo models. We identify common characteristics responsible for the oscillatory nature...