Solar Physics

, Volume 168, Issue 1, pp 205–210 | Cite as

Periodicities in the N-S asymmetry of long-lived solar filaments

  • P. I. Duchlev
  • V. N. Dermendjiev


The N-S asymmetry of the long-lived solar filaments published in the Meudon catalogues for the time interval 1919–1989 is studied by means of power-spectrum analysis. Statistically significant periods of 35.0 and 11.7 yr are obtained. There are no statistically significant periods shorter than 11 yr.


Significant Period Solar Filament 
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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • P. I. Duchlev
    • 1
  • V. N. Dermendjiev
    • 1
  1. 1.Institute of Astronomy and NAOSofiaBulgaria

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