Periodicities in the north-south asymmetry of solar activity

Details Periodicities in the north-south asymmetry of solar activity Periodicities in the north-south asymmetry of solar activity

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..119..411v&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 119, no. 2, 1989, p. 411-414.

Physics

15

Asymmetry, Periodic Variations, Solar Flares, Solar Prominences, Power Spectra, Solar Physics

Scientific paper

A Blackman-Tukey power spectrum is performed on the values of the north-south asymmetry in the sudden disappearance of solar prominences, and the results are reported. The findings confirm the proposed existence of a periodicity of around 11 years and fails to confirm another short periodicity of around 2.3 years. The results of the power spectrum performed using values of the flare number and flare index north-south asymmetry provide a significant peak of 3.1-3.2 years. This short periodicity could be related to those found by Ramanuja Rao (1973) in several indices of solar activity.

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