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 Heure: 11:30 Lieu: Université de Montréal Pavillon Roger-Gaudry, local D-460 Contact: Paul Charbonneau