Speaker
Dr
Martin Schrinner
Description
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 of
these dynamos. A mean-field view on some of them reveals the
underlying dynamo mechanisms. Somewhat surprisingly, an
alpha-omega mechanism does not seem to be a necessary
constraint for this class of dynamos. Possible implications
for the solar dynamo are also discussed.
