Journal
ADVANCES IN SPACE RESEARCH
Volume 40, Issue 7, Pages 951-958Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2006.12.050
Keywords
solar activity; dynamo; active longitudes
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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. (C) 2007 Published by Elsevier Ltd on behalf of COSPAR.
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