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Alleviating alpha quenching by solar wind and meridional flows
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi.
2011 (engelsk)Inngår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 526, s. A138-Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2011. Vol. 526, s. A138-
Emneord [en]
Sun: dynamo, magnetohydrodynamics (MHD)
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-67344DOI: 10.1051/0004-6361/201015637ISI: 000286458400150OAI: oai:DiVA.org:su-67344DiVA, id: diva2:470272
Merknad
authorCount :4Tilgjengelig fra: 2011-12-28 Laget: 2011-12-28 Sist oppdatert: 2017-12-08bibliografisk kontrollert

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