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The Waldmeier effect and the flux transport solar dynamo

Karak, Bidya Binay and Choudhuri, Arnab Rai (2011) The Waldmeier effect and the flux transport solar dynamo. In: Monthly Notices of the Royal Astronomical Society, 410 (3). pp. 1503-1512.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-...

Abstract

We confirm that the evidence for the Waldmeier effect WE1 (the anticorrelation between rise times of sunspot cycles and their strengths) and the related effect WE2 (the correlation between rise rates of cycles and their strengths) is found in different kinds of sunspot data. We explore whether these effects can be explained theoretically on the basis of the flux transport dynamo models of sunspot cycles. Two sources of irregularities of sunspot cycles are included in our model: fluctuations in the poloidal field generation process and fluctuations in the meridional circulation. We find WE2 to be a robust result which is produced in different kinds of theoretical models for different sources of irregularities. The Waldmeier effect WE1, on the other hand, arises from fluctuations in the meridional circulation and is found only in the theoretical models with reasonably high turbulent diffusivity which ensures that the diffusion time is not more than a few years.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: Sun: activity; Sun: dynamo; sunspots
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Mar 2011 04:47
Last Modified: 09 Mar 2011 04:47
URI: http://eprints.iisc.ernet.in/id/eprint/35887

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