The Role of Multi cellular Meridional Flows in Setting the Cycle Period and Field Parity in Solar Dynamo Models

Details The Role of Multi cellular Meridional Flows in Setting the Cycle Period and Field Parity in Solar Dynamo Models The Role of Multi cellular Meridional Flows in Setting the Cycle Period and Field Parity in Solar Dynamo Models

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..12j&link_type=abstract

Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,

Computer Science

Scientific paper

Inspired by recent observations and 3-D simulations that both exhibit multicellular flows in the solar convective zone, we seek to characterize the influence of such flows on the behaviour of solar dynamo models. We focused on two particular points: the role played by these flows in setting the cycle period and the so-called magnetic field parity issue, namely the field parity switching from an antisymmetric, dipolar field configuration to a symmetric, mostly quadrupolar one, that has already been discussed by several authors in the recent literature. Using a 2-D mean field Babcock-Leighton (B-L) model of the solar dynamo, we confirm that adding cells in latitude tends to speed up the dynamo cycle whereas we find that adding cells in radius increases the cycle period by more than 60%. Moreover, our studies show that adding cells both in radius and in latitude imposes symmetry conservation: the presence of more complex mean meridional flows in the model suppresses the switching of the field parity from a dipolar configuration to a quadrupolar one, thus resolving the parity issue seen in classical B-L solar dynamo models.

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