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Quenching of Meridional Circulation in Flux Transport Dynamo Models

Karak, Bidya Binay and Choudhuri, Arnab Rai (2012) Quenching of Meridional Circulation in Flux Transport Dynamo Models. In: SOLAR PHYSICS, 278 (1). pp. 137-148.

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Official URL: http://dx.doi.org/10.1007/s11207-012-9928-5

Abstract

Guided by the recent observational result that the meridional circulation of the Sun becomes weaker at the time of the sunspot maximum, we have included a parametric quenching of the meridional circulation in solar dynamo models such that the meridional circulation becomes weaker when the magnetic field at the base of the convection zone is stronger. We find that a flux transport solar dynamo tends to become unstable on including this quenching of meridional circulation if the diffusivity in the convection zone is less than about 2x10(11) cm(2) s(-1). The quenching of alpha, however, has a stabilizing effect and it is possible to stabilize a dynamo with low diffusivity with sufficiently strong alpha-quenching. For dynamo models with high diffusivity, the quenching of meridional circulation does not produce a large effect and the dynamo remains stable. We present a solar-like solution from a dynamo model with diffusivity 2.8x10(12) cm(2) s(-1) in which the quenching of meridional circulation makes the meridional circulation vary periodically with solar cycle as observed and does not have any other significant effect on the dynamo.

Item Type: Journal Article
Additional Information: copyright for this article belongs to Cornell University Library
Keywords: FULL-SPHERE SIMULATIONS;DOMINATED SOLAR DYNAMO;DIFFERENTIAL ROTATION;PARITY ISSUE;MAGNETIC CYCLE;FLOW;MINIMUM
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 16 Jul 2012 10:04
Last Modified: 16 Jul 2012 10:07
URI: http://eprints.iisc.ernet.in/id/eprint/44599

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