On the Large-Scale Diffuse Magnetic Field of the Sun

Mausumi, Dikpati and Choudhuri, Arnab Rai (1995) On the Large-Scale Diffuse Magnetic Field of the Sun. In: Solar Physics, 161 (1). pp. 9-27.

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Abstract

Although the sunspots migrate towards the equator, the large-scale weak diffuse magnetic fields of the Sun migrate poleward with the solar cycle, the polar field reversing at the time of the sunspot maxima. We apply the vector model of Dikpati and Choudhuri (1994, Paper I) to fit these observations. The dynamo layer at the base of the convection zone is taken to be the source of the diffuse field, which is then evolved in the convection zone subject to meridional circulation and turbulent diffusion. We find that the longitudinally averaged observational data can be fitted reasonably well both for positive and negative values of the alpha-effect by adjusting the subsurface meridional flow suitably. The model will be extended in a future paper to include the decay of active regions as an extra source of the diffuse field, which may be necessary to explain the probable phase lag between B-tau and B-phi at lower latitudes.

Item Type:	Journal Article
Publication:	Solar Physics
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	24 May 2011 07:20
Last Modified:	24 May 2011 07:20
URI:	http://eprints.iisc.ac.in/id/eprint/37817

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