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

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

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008soph..247..379b&link_type=abstract

Solar Physics, Volume 247, Issue 2, pp.379-397

Physics

12

Coronal Green Line, Sunspots, North&Thinsp, &Ndash, &Thinsp, South Asymmetry, Quasi-Biennial Oscillations

Scientific paper

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.

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