Solar Physics

, Volume 150, Issue 1–2, pp 339–346 | Cite as

The 73-day periodicity of the flare index during the current solar cycle 22

  • Atila Özgüç
  • Tamer Ataç


The flare index of the current solar cycle 22 is analysed to detect periodicities. Power spectral analysis of the time series of solar flare index data reveals a periodicity around 73 and 53 days. We find that a periodicity of 73 days was in operation from November 1988 to the end of December 1991. We also find that when the 73-day periodicity or the 154-day periodicity is in operation the flare index is well correlated with the relative sunspot numbers.


Flare Solar Cycle Solar Phys Sunspot Number False Alarm Probability 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Ataç, T.: 1987,Astrophys. Space Sci. 135, 201.CrossRefADSGoogle Scholar
  2. Bai, T.: 1987,Astrophys. J. 318, L85.CrossRefADSGoogle Scholar
  3. Bai, T.: 1992,Astrophys. J. 388, L69.CrossRefADSGoogle Scholar
  4. Bai, T. and Sturrock, P. A.: 1991,Nature 352, 360.CrossRefGoogle Scholar
  5. Bai, T. and Sturrock, P. A.: 1993,Astrophys. J. 409, 476.CrossRefADSGoogle Scholar
  6. Bloomfield, P.: 1976,Fourier Analysis of Time Series: An Introduction, John Wiley and Sons, New York.Google Scholar
  7. Bogard, R. S. and Bai, T.: 1985,Astrophys. J. 229, L51.CrossRefADSGoogle Scholar
  8. Brueckner, G. F. and Cook, J. W.: 1990,Astrophys. J. 350, L21.CrossRefADSGoogle Scholar
  9. Carbonell, M. and Ballester, J. L.: 1990,Astron. Astrophys. 238, 37.ADSGoogle Scholar
  10. de Jager, C.: 1987, Ph.D. Thesis, Potchefstroom University.Google Scholar
  11. Delache, P. and Scherrer, P. H.: 1983,Nature 306, 651.CrossRefADSGoogle Scholar
  12. Delache, P., OLaclare, F., and Sadsaoud, H.: 1985,Nature 317, 416.CrossRefADSGoogle Scholar
  13. Gabriel, S., Evans, R., and Feynman, J.: 1990,Solar Phys. 128, 415.CrossRefADSGoogle Scholar
  14. Horne, J. H. and Baliunas, S. L.: 1986,Astrophys. J. 302, 757.CrossRefADSGoogle Scholar
  15. Ichimoto, K., Kubato, J., Suzuki, M., Tohmura, I., and Kurokawa, H.: 1985,Nature 316, 422.CrossRefADSGoogle Scholar
  16. Kile, J. N. and Cliver, E. W.: 1991,Astrophys. J. 370, 442.CrossRefADSGoogle Scholar
  17. Kleczek, J.: 1952,Publ. Centr. Inst. Astron. No. 22, Prague.Google Scholar
  18. Knoška, S. and Petrášek, J.: 1984,Contr. Astron. Obs. Skalnaté Pleso 12, 165.ADSGoogle Scholar
  19. Lean, J. L. and Brueckner, G. E.: 1989,Astrophys. J. 337, 568.CrossRefADSGoogle Scholar
  20. Mayfield, E. B. and Lawrence, J. K.: 1985,Solar Phys. 96, 293.CrossRefADSGoogle Scholar
  21. Özgüç, A.: 1989,Astrophys. Space Sci. 162, 123.CrossRefGoogle Scholar
  22. Özgüç, A.: 1992,Astrophys. Space Sci. 187, 197.CrossRefGoogle Scholar
  23. Özgüç, A. and Ataç, T.: 1989,Solar Phys. 123, 357.CrossRefADSGoogle Scholar
  24. Rieger, E., Share, G. H., Forrest, D. J., Kanbach, G., Reppin, C., and Chupp, E. L.: 1984,Nature 312, 623.CrossRefADSGoogle Scholar
  25. Scargle, J. D.: 1982,Astrophys. J. 263, 835.CrossRefADSGoogle Scholar
  26. Wolff, C. L.: 1983,Astrophys. J. 264, 667.CrossRefADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Atila Özgüç
    • 1
  • Tamer Ataç
    • 1
  1. 1.Kandilli ObservatoryBoğaziçi UniversityIstanbulTurkey

Personalised recommendations