Fluctuations in the alpha-effect and grand solar minima

Olemskoy, SV and Choudhuri, AR and Kitchatinov, LL (2013) Fluctuations in the alpha-effect and grand solar minima. In: Astronomy Reports, 57 (6). pp. 458-468.

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Abstract

The parameters of a special type of alpha-effect known in dynamo theory as the Babcock-Leighton mechanism are estimated using the data of sunspot catalogs. The estimates support the presence of the Babcock-Leighton alpha-effect on the Sun. Fluctuations of the alpha-effect are also estimated. The fluctuation amplitude appreciably exceeds themean value, and the characteristic time for the fluctuations is comparable to the period of the solar rotation. Fluctuations with the parameters found are included in a numericalmodel for the solar dynamo. Computations show irregular changes in the amplitudes of the magnetic cycles on time scales of centuries and millennia. The calculated statistical characteristics of the grand solar minima and maxima agree with the data on solar activity over the Holocene.

Item Type:	Journal Article
Publication:	Astronomy Reports
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	18 Jul 2013 07:05
Last Modified:	18 Jul 2013 07:05
URI:	http://eprints.iisc.ac.in/id/eprint/46853

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