Solar dynamo evolution in the non-kinematic regime
CENTRA/IST, Univ. Evora, Portugal; UdeM/Physique
One of the most used tools to study the behavior and evolution of the large
scale solar magnetic field is flux transport dynamo theory.
Models based on this framework are very popular nowadays and have been used
even for the prediction of upcoming solar cycles.
Nevertheless, these models take into account the effect of solar meridional
circulation mainly in the kinematic regime, i.e., the magnetic
field does not affect the plasma velocity field.
In this talk I'll address this problem by presenting evidence that the
Lorentz force feedback of the magnetic fields in the meridional flow
is important for the evolution of the solar cycle. We analyze the relation
between magnetic field and flows in the Global large-eddy simulation
of Ghizaru et al ApJ, 2010. Afterwards the preliminary results obtained are
used to build a simplified dynamo model with which we study the
long term dynamics caused by the Lorentz feedback.
|Date: ||Jeudi, le 28 juillet 2011|
|Lieu: ||Université de Montréal|
| ||Pavillon Roger-Gaudry, local D-460|
|Contact: ||Paul Charbonneau|