Convective Babcock-Leighton Dynamo Models

Type Journal Article
Names Mark S. Miesch, Benjamin P. Brown
Publication The Astrophysical Journal Letters
Volume 746
Issue 2
Pages L26
Date February 1, 2012
DOI DOI: 10.1088/2041-8205/746/2/L26; eprintid: arXiv:1201.2685
Library Catalog NASA ADS
Abstract We present the first global, three-dimensional simulations of solar/stellar convection that take into account the influence of magnetic flux emergence by means of the Babcock-Leighton (BL) mechanism. We have shown that the inclusion of a BL poloidal source term in a convection simulation can promote cyclic activity in an otherwise steady dynamo. Some cycle properties are reminiscent of solar observations, such as the equatorward propagation of toroidal flux near the base of the convection zone. However, the cycle period in this young sun (rotating three times faster than the solar rate) is very short (~6 months) and it is unclear whether much longer cycles may be achieved within this modeling framework, given the high efficiency of field generation and transport by the convection. Even so, the incorporation of mean-field parameterizations in three-dimensional convection simulations to account for elusive processes such as flux emergence may well prove useful in the future modeling of solar and stellar activity cycles.
Tags Convection, Magnetohydrodynamics: MHD, SUN: INTERIOR, Sun: dynamo, stars: magnetic field
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