Toward a Mean Field Formulation of the Babcock-Leighton Type Solar Dynamo. I. α-Coefficient versus Durney's Double-Ring Approach

Nandy, Dibyendu and Choudhuri, Arnab Rai (2001) Toward a Mean Field Formulation of the Babcock-Leighton Type Solar Dynamo. I. α-Coefficient versus Durney's Double-Ring Approach. In: The Astrophysical Journal, 551 (1). pp. 576-585.

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Abstract

We develop a model of the solar dynamo in which, on the one hand, we follow the Babcock-Leighton approach to include surface processes, such as the production of poloidal field from the decay of active regions, and, on the other hand, we attempt to develop a mean field theory that can be studied in quantitative detail. One of the main challenges in developing such models is to treat the buoyant rise of the toroidal field and the production of poloidal field from it near the surface. A previous paper by Choudhuri, Schüssler, & Dikpati in 1995 did not incorporate buoyancy. We extend this model by two contrasting methods. In one method, we incorporate the generation of the poloidal field near the solar surface by Durney's procedure of double-ring eruption. In the second method, the poloidal field generation is treated by a positive α-effect concentrated near the solar surface coupled with an algorithm for handling buoyancy. The two methods are found to give qualitatively similar results.

Item Type:	Journal Article
Publication:	The Astrophysical Journal
Publisher:	Institute of physics
Additional Information:	Copyright of this article belongs to Institute of physics.
Keywords:	MHD-Sun;interior-Sun;magnetic Ðelds
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	01 Aug 2011 07:32
Last Modified:	01 Aug 2011 07:32
URI:	http://eprints.iisc.ac.in/id/eprint/39646

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