Long-term persistence of solar active longitudes and its implications for the solar dynamo theory

Usoskin, I. G. and Berdyugina, S. V. and Moss, D. and Sokoloff, D. D. (2007) Long-term persistence of solar active longitudes and its implications for the solar dynamo theory. Advances in Space Research, 40. pp. 951-958. ISSN 0273-1177

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Abstract

We present an overview of the observational results related to the existence of long-lived sunspot active longitudes. These are affected by the solar differential rotation. The existence of such migrating active longitudes imposes an important constraint on the dynamo theory. We review different approaches to model non-axisymmetry in solar dynamo models and find that, in principle, plausible mechanisms exist to reproduce the observed non-axisymmetry. The most favorable interpretation is suggested by the ‘stroboscopic effect’, where a quasi-rigidly rotating non-axisymmetric mean-field can produce seemingly migrating active longitudes in sunspots. Other scenarios are less favorable but cannot yet be excluded.

Item Type: Article
Uncontrolled Keywords: Solar activity; Dynamo; Active longitudes
Subjects: MSC 2010, the AMS's Mathematics Subject Classification > 85 Astronomy and astrophysics
PACS 2010, the AIP's Physics and Astronomy Classification Scheme > 90 GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS > 96 Solar System
Depositing User: Ms Lucy van Russelt
Date Deposited: 06 Nov 2008
Last Modified: 20 Oct 2017 14:12
URI: http://eprints.maths.manchester.ac.uk/id/eprint/1167

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