On the Compatibility of a Flux Transport Dynamo with a Fast Tachocline Scenario

Karak, Bidya Binay and Petrovay, Kristof (2013) On the Compatibility of a Flux Transport Dynamo with a Fast Tachocline Scenario. In: SOLAR PHYSICS, 282 (2). pp. 321-334.

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Abstract

The compatibility of the fast-tachocline scenario with a flux-transport dynamo model is explored. We employ a flux-transport dynamo model coupled with simple feedback formulae relating the thickness of the tachocline to the amplitude of the magnetic field or to the Maxwell stress. The dynamo model is found to be robust against the nonlinearity introduced by this simplified fast-tachocline mechanism. Solar-like butterfly diagrams are found to persist and, even without any parameter fitting, the overall thickness of the tachocline is well within the range admitted by helioseismic constraints. In the most realistic case of a time-and latitude-dependent tachocline thickness linked to the value of the Maxwell stress, both the thickness and its latitudinal dependence are in excellent agreement with seismic results. In nonparametric models, cycle-related temporal variations in tachocline thickness are somewhat larger than admitted by helioseismic constraints; we find, however, that introducing a further parameter into our feedback formula readily allows further fine tuning of the thickness variations.

Item Type:	Journal Article
Publication:	SOLAR PHYSICS
Publisher:	SPRINGER
Additional Information:	Copyright for this article belongs to SPRINGER, NETHERLANDS
Keywords:	Dynamo;Tachocline
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	21 Feb 2013 10:06
Last Modified:	21 Feb 2013 10:06
URI:	http://eprints.iisc.ac.in/id/eprint/45843

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