Abstract
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.
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References
Ataç, T.: 1987,Astrophys. Space Sci. 135, 201.
Bai, T.: 1987,Astrophys. J. 318, L85.
Bai, T.: 1992,Astrophys. J. 388, L69.
Bai, T. and Sturrock, P. A.: 1991,Nature 352, 360.
Bai, T. and Sturrock, P. A.: 1993,Astrophys. J. 409, 476.
Bloomfield, P.: 1976,Fourier Analysis of Time Series: An Introduction, John Wiley and Sons, New York.
Bogard, R. S. and Bai, T.: 1985,Astrophys. J. 229, L51.
Brueckner, G. F. and Cook, J. W.: 1990,Astrophys. J. 350, L21.
Carbonell, M. and Ballester, J. L.: 1990,Astron. Astrophys. 238, 37.
de Jager, C.: 1987, Ph.D. Thesis, Potchefstroom University.
Delache, P. and Scherrer, P. H.: 1983,Nature 306, 651.
Delache, P., OLaclare, F., and Sadsaoud, H.: 1985,Nature 317, 416.
Gabriel, S., Evans, R., and Feynman, J.: 1990,Solar Phys. 128, 415.
Horne, J. H. and Baliunas, S. L.: 1986,Astrophys. J. 302, 757.
Ichimoto, K., Kubato, J., Suzuki, M., Tohmura, I., and Kurokawa, H.: 1985,Nature 316, 422.
Kile, J. N. and Cliver, E. W.: 1991,Astrophys. J. 370, 442.
Kleczek, J.: 1952,Publ. Centr. Inst. Astron. No. 22, Prague.
Knoška, S. and Petrášek, J.: 1984,Contr. Astron. Obs. Skalnaté Pleso 12, 165.
Lean, J. L. and Brueckner, G. E.: 1989,Astrophys. J. 337, 568.
Mayfield, E. B. and Lawrence, J. K.: 1985,Solar Phys. 96, 293.
Özgüç, A.: 1989,Astrophys. Space Sci. 162, 123.
Özgüç, A.: 1992,Astrophys. Space Sci. 187, 197.
Özgüç, A. and Ataç, T.: 1989,Solar Phys. 123, 357.
Rieger, E., Share, G. H., Forrest, D. J., Kanbach, G., Reppin, C., and Chupp, E. L.: 1984,Nature 312, 623.
Scargle, J. D.: 1982,Astrophys. J. 263, 835.
Wolff, C. L.: 1983,Astrophys. J. 264, 667.
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Özgüç, A., Ataç, T. The 73-day periodicity of the flare index during the current solar cycle 22. Sol Phys 150, 339–346 (1994). https://doi.org/10.1007/BF00712895
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DOI: https://doi.org/10.1007/BF00712895