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Oscillatory migratory large-scale fields in mean-field and direct simulations
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
2009 (English)In: Proceedings of the International Astronomical Union, ISSN 1743-9213, E-ISSN 1743-9221, Vol. 5, 197-201 p.Article in journal (Refereed) Published
Abstract [en]

We summarise recent results form direct numerical simulations of both non-rotating helically forced and rotating convection driven MHD equations in spherical wedge-shape domains. In the former, using perfect-conductor boundary conditions along the latitudinal boundaries we observe oscillations, polarity reversals and equatorward migration of the large-scale magnetic fields. In the latter we obtain angular velocity with cylindrical contours and large-scale magnetic field which shows oscillations, polarity reversals but poleward migration. The occurrence of these behviours in direct numerical simulations is clearly of interest. However the present models as they stand are not directly applicable to the solar dynamo problem. Nevertheless, they provide general insights into the operation of turbulent dynamos.

Place, publisher, year, edition, pages
2009. Vol. 5, 197-201 p.
Keyword [en]
MHD, convection, Sun: magnetic fields
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-70506DOI: 10.1017/S1743921309992626OAI: diva2:481686

Solar and Stellar Variability: Impact on Earth and Planets, Symposium S264, ed. A. Kosovichev et al., CUP

Available from: 2012-01-22 Created: 2012-01-22 Last updated: 2016-07-01Bibliographically approved

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Brandenburg, Axel
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Department of AstronomyNordic Institute for Theoretical Physics (Nordita)
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ReferencesLink to record
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