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A THEORETICAL STUDY OF THE BUILD-UP OF THE SUN'S POLAR MAGNETIC FIELD BY USING A 3D KINEMATIC DYNAMO MODEL

Hazra, Gopal and Choudhuri, Arnab Rai and Miesch, Mark S (2017) A THEORETICAL STUDY OF THE BUILD-UP OF THE SUN'S POLAR MAGNETIC FIELD BY USING A 3D KINEMATIC DYNAMO MODEL. In: ASTROPHYSICAL JOURNAL, 835 (1).

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Official URL: http://dx.doi.org/10.3847/1538-4357/835/1/39

Abstract

We develop a three-dimensional kinematic self-sustaining model of the solar dynamo in which the poloidal field generation is from tilted bipolar sunspot pairs placed on the solar surface above regions of strong toroidal field by using the SpotMaker algorithm, and then the transport of this poloidal field to the tachocline is primarily caused by turbulent diffusion. We obtain a dipolar solution within a certain range of parameters. We use this model to study the build-up of the polar magnetic field and show that some insights obtained from surface flux transport models have to be revised. We present results obtained by putting a single bipolar sunspot pair in a hemisphere and two symmetrical sunspot pairs in two hemispheres. We find that the polar fields produced by them disappear due to the upward advection of poloidal flux at low latitudes, which emerges as oppositely signed radial flux and which is then advected poleward by the meridional flow. We also study the effect that a large sunspot pair, violating Hale's polarity law, would have on the polar field. We find that there would be some effect-especially if the anti-Hale pair appears at high latitudes in the mid-phase of the cycle-though the effect is not very dramatic.

Item Type: Journal Article
Publication: ASTROPHYSICAL JOURNAL
Publisher: IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Additional Information: Copy right for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Mar 2017 06:08
Last Modified: 09 Mar 2017 06:08
URI: http://eprints.iisc.ac.in/id/eprint/56356

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