On the cause of solar-like equatorward migration in global convective dynamo simulations

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2014
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Mcode
Degree programme
Language
en
Pages
6
Series
ASTROPHYSICAL JOURNAL LETTERS, Volume 796, issue 1
Abstract
We present results from four convectively driven stellar dynamo simulations in spherical wedge geometry. All of these simulations produce cyclic and migrating mean magnetic fields. Through detailed comparisons, we show that the migration direction can be explained by an αΩ dynamo wave following the Parker-Yoshimura rule. We conclude that the equatorward migration in this and previous work is due to a positive (negative) α effect in the northern (southern) hemisphere and a negative radial gradient of Ω outside the inner tangent cylinder of these models. This idea is supported by a strong correlation between negative radial shear and toroidal field strength in the region of equatorward propagation.
Description
VK: resolve; Karhunen, J.; ReSoLVE
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Citation
Warnecke , J , Käpylä , P J , Käpylä , M J & Brandenburg , A 2014 , ' On the cause of solar-like equatorward migration in global convective dynamo simulations ' , Astrophysical Journal Letters , vol. 796 , no. 1 , L12 . https://doi.org/10.1088/2041-8205/796/1/L12