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Alleviating alpha quenching by solar wind and meridional flows
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy.
2011 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 526, A138- p.Article in journal (Refereed) Published
Abstract [en]

Aims. We study the ability of magnetic helicity expulsion to alleviate catastrophic alpha-quenching in mean field dynamos in two-dimensional spherical wedge domains. Methods. Motivated by the physical state of the outer regions of the Sun, we consider alpha(2)Omega mean field models with a dynamical a quenching. We include two mechanisms which have the potential to facilitate helicity expulsion, namely advection by a mean flow (solar wind) and meridional circulation. Results. We find that a wind alone can prevent catastrophic quenching, with the field saturating at finite amplitude. In certain parameter ranges, the presence of a large-scale meridional circulation can reinforce this alleviation. However, the saturated field strengths are typically below the equipartition field strength. We discuss possible mechanisms that might increase the saturated field.

Place, publisher, year, edition, pages
2011. Vol. 526, A138- p.
Keyword [en]
Sun: dynamo, magnetohydrodynamics (MHD)
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-67344DOI: 10.1051/0004-6361/201015637ISI: 000286458400150OAI: diva2:470272
authorCount :4Available from: 2011-12-28 Created: 2011-12-28 Last updated: 2011-12-28Bibliographically approved

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Brandenburg, Axel
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Nordic Institute for Theoretical Physics (Nordita)Department of Astronomy
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