Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-09-30
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 2 color figures. To appear in Proc. IAU Symposium 271, "Astrophysical Dynamics, from Stars to Galaxies", ed. A.S. Bru
Scientific paper
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.
Brown Benjamin P.
Browning Matthew K.
Brun Allan Sacha
Miesch Mark S.
Toomre Juri
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