Solar Physics

, Volume 237, Issue 2, pp 433–444 | Cite as

Periodicities in Irradiance and in other Solar Activity Indices During Cycle 23

  • T. AtaçEmail author
  • A. Özgüç
  • J. Rybak


Magnetic fields give rise to distinctive features in different solar atmospheric regimes. To study this, time variations of the flare index, sunspot number and sunspot area, each index arising from different physical conditions, were compared with the solar composite irradiance throughout cycle 23. Rieger-type periodicities in these time series were calculated using Fourier and wavelet transforms (WTs). The peaks of the wavelet power of these periodicities appeared between the years 1999 and 2002. We found that the solar irradiance oscillations are less significant than those in the other indices during this cycle. The irradiance shows non-periodic fluctuations during this time interval. The peaks of the flare index, sunspot number and sunspot total area were seen around 2000.4, 1999.9 and 2001.0, respectively. These periodicities appeared intermittently and were not simultaneous in different solar activity indices during the three years of the maximum phase of solar cycle 23.


Solar Activity Solar Cycle Sunspot Number Sunspot Area Solar Total Irradiance 
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. Bai, T.: 2003, Astrophys. J. 591, 406.CrossRefADSGoogle Scholar
  2. Ballester, J.L., Oliver, R., and Carbonell, M.: 2002, Astrophys. J. 566, 505.CrossRefADSGoogle Scholar
  3. Ballester, J.L., Oliver, R., and Carbonell, M.: 2004, Astrophys. J. Lett. 615, L173.CrossRefADSGoogle Scholar
  4. Barbieri, L.P. and Mahmot, R.E.: 2004, Space Weather 2, S09002.CrossRefADSGoogle Scholar
  5. Fröhlich, C. and Lean, J.: 1998, Geophys. Res. Lett. 25, 4377.CrossRefADSGoogle Scholar
  6. Howe, R., Christensen-Dalsgaard, J., Hill, F., et al.: 2000, Science 287, 2456.CrossRefADSGoogle Scholar
  7. Joshi, B. and Joshi, A.: 2005, Solar Phys. 226, 153.CrossRefADSGoogle Scholar
  8. Kleczek, J.: 1952, Publ. Centr. Inst. Astron. No. 22, Prague.Google Scholar
  9. Knaack, R., Stenflo, J.O., and Berdyugina, S.V.: 2005, Astron. Astrophys. 438, 1067.CrossRefADSGoogle Scholar
  10. Krivova, N.A. and Solanki, S.K.: 2002, Astron. Astrophys. 394, 701.CrossRefADSGoogle Scholar
  11. Lou, Y.Q., Wang, Y.M., Fan, Z., Wang, S., and Wang, J.X.: 2003, Month. Not. R. Astron. Soc. 345, 809.CrossRefADSGoogle Scholar
  12. Özgüç, A., Ataç, T., and Rybak, J.: 2003, Solar Phys. 214, 375.CrossRefADSGoogle Scholar
  13. Özgüç, A., Ataç, T., and Rybak, J.: 2004, Solar Phys. 223, 287.CrossRefADSGoogle Scholar
  14. Richardson, I.G. and Cane, H.V.: 2005, Geophys. Res. Lett. 32, L02104.CrossRefGoogle Scholar
  15. Rieger, E., Share, G.H., Forrest, D.J., Kanbach, G., Reppin, C., and Chupp, E.L.: 1984, Nature 312, 623.CrossRefADSGoogle Scholar
  16. Scargle, J.D.: 1982, Astrophys. J. 263, 835.CrossRefADSGoogle Scholar
  17. Torrence, C. and Compo, G.P.: 1998, Bull. Am. Meteor. Soc. 79, 61.CrossRefADSGoogle Scholar
  18. Wenzler, T., Solanki, S.K., and Krivova, N.A.: 2005, Astron. Astrophys. 432, 1057.CrossRefADSGoogle Scholar
  19. Zieba, S., Maslowski, J., Michalec, A., and Kulak, A.: 2001, Astron. Astrophys. 377, 297.CrossRefADSGoogle Scholar

Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Kandilli Observatory and E.R.IBoğaziçi UniversityIstanbulTurkey
  2. 2.Astronomical InstituteSlovak Academy of SciencesTatranska LomnicaSlovak Republic

Personalised recommendations