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Solar Physics

, Volume 247, Issue 2, pp 379–397 | Cite as

Quasi-Biennial Oscillations in the North – South Asymmetry of Solar Activity

  • O. G. Badalyan
  • V. N. Obridko
  • J. Sýkora
Article

Abstract

The north – south (N – S) asymmetry of solar activity is investigated by using the data on coronal green-line brightness and total number and total area of sunspots over the period of 1939  –  2001. Typical time variations of the N – S asymmetry are found to be consonant in these indices. Quasi-biennial oscillations (QBO) of solar activity are well recognizable in the N – S asymmetry of the examined indices. Moreover, the QBO are much better manifested in the N – S asymmetry of the individual indices than in the original (N plus S) indices. The time variations of relative QBO power are synchronous for the N – S asymmetry of various solar activity indices whereas such a synchronization is weaker for the indices themselves. It is revealed that the relative QBO power found in the N – S asymmetry of the studied indices has a negative correlation with the value of the N – S asymmetry itself. The findings indicate that the N – S asymmetry should be regarded as a fundamental phenomenon of solar activity similarly manifested in different activity indices. These findings should be taken into account when any dynamo theory of solar activity is constructed.

Keywords

Coronal green line Sunspots North – south asymmetry Quasi-biennial oscillations 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave PropagationTroitskRussia
  2. 2.Astronomical Institute of the Slovak Academy of SciencesTatranská LomnicaSlovak Republic

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