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On the cause of solar-like equatorward migration in global convective dynamo simulations
Aalto University, Finland.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.ORCID iD: 0000-0002-7304-021X
2014 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 796, no 1, L12- p.Article in journal (Refereed) Published
Abstract [en]

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 alpha Omega dynamo wave following the Parker-Yoshimura rule. We conclude that the equatorward migration in this and previous work is due to a positive (negative) alpha effect in the northern (southern) hemisphere and a negative radial gradient of Omega 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.

Place, publisher, year, edition, pages
2014. Vol. 796, no 1, L12- p.
Keyword [en]
convection, dynamo, magnetohydrodynamics (MHD), Sun: activity, Sun: magnetic fields, Sun: rotation, turbulence
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-157595DOI: 10.1088/2041-8205/796/1/L12ISI: 000344647000012ScopusID: 2-s2.0-84909944275OAI: diva2:771069
Swedish Research Council, 621-2011-5076 2012-5797

QC 20141212

Available from: 2014-12-12 Created: 2014-12-11 Last updated: 2014-12-12Bibliographically approved

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Käpylä, Petri J.Brandenburg, Axel
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