Laboratoire des Écoulements Géophysiques et Industriels

Astrophysikalisches Institut Potsdam

Place: Building 19, Room 19.415

Resume:

Our aim is to study the generation mechanisms of magnetic field on
geodynamo models. In that sense, the mean field dynamo theory has proved
to be a useful tool in the comprehension of these processes. We propose a
model with a ring of vortexes as have been observed in studies of fluid
motion in the earth's core. Using the mean field concept we calculate
analytically, for the proposed model, the mean electromotive force and the
alpha tensor in the stationary case without mean flow. Our calculation
relies on the second order correlation approximation.