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Magnetic Cycles and Meridional Circulation in Global Models of Solar Convection

Published online by Cambridge University Press:  12 August 2011

Mark S. Miesch ,
Benjamin P. Brown ,
Matthew K. Browning ,
Allan Sacha Brun  and
Juri Toomre
Mark S. Miesch
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, 80307-3000, USA email: miesch@ucar.edu
Benjamin P. Brown
Affiliation:
Dept. of Astronomy, Univ. of Wisconsin, 475 N. Charter St., Madison, WI 53706, USA
Matthew K. Browning
Affiliation:
Canadian Institute for Theoretical Astrophysics, Univ. of Toronto, Toronto, ON M5S3H8, Canada
Allan Sacha Brun
Affiliation:
DSM/IRFU/SAp, CEA-Saclay and UMR AIM, CEA-CNRS-Université Paris 7, 91191 Gif-sur-Yvette, France
Juri Toomre
Affiliation:
JILA and Dept. of Astrophysical & Planetary Sciences, Univ. of Colorado, Boulder, CO 80309-0440, USA
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Abstract

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We review recent insights into the dynamics of the solar convection zone obtained from global numerical simulations, focusing on two recent developments in particular. The first is quasi-cyclic magnetic activity in a long-duration dynamo simulation. Although mean fields comprise only a few percent of the total magnetic energy they exhibit remarkable order, with multiple polarity reversals and systematic variability on time scales of 6-15 years. The second development concerns the maintenance of the meridional circulation. Recent high-resolution simulations have captured the subtle nonlinear dynamical balances with more fidelity than previous, more laminar models, yielding more coherent circulation patterns. These patterns are dominated by a single cell in each hemisphere, with poleward and equatorward flow in the upper and lower convection zone respectively. We briefly address the implications of and future of these modeling efforts.

Keywords

Sun: InteriorConvectiondynamoMHD
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 261 - 269
Copyright
Copyright © International Astronomical Union 2011

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