Solar Physics

, Volume 233, Issue 1, pp 139–153 | Cite as

Overview of the Solar Activity During Solar Cycle 23

  • Tamer AtaçEmail author
  • Atila Özgüç


A brief description and final results of the flare index and some other indices of solar activity for cycle 23 from January 1, 1996 to December 31, 2003 are given. It is found that there is enough evidence to support that the present cycle is magnetically weak. The patterns of similar activity indices that arise under different physical conditions during cycle 23 were compared with the flare index. The photospheric magnetic flux and flare activity show very low values at the maximum of cycle 23 compared with the maximum phase of cycle 22. The major flare production during this cycle is very low while the quiet geomagnetic conditions are remarkably high during the rising and the maximum phase of the current cycle. The north–south asymmetry of CMEs, sunspot number, sunspot area, and flare index were studied. N–S asymmetry had increased in favor of the southern hemisphere for solar cycle 23 after the inverse polarities were installed. The intermediate-term periodicities in the daily flare index data for the northern and the southern hemispheres and full disc were calculated using the Fourier transform, and it was found that 64, 83, and 125 days periodicities are in operation during the maximum phase of the solar cycle 23.


Flare Solar Activity Southern Hemisphere Solar Cycle Sunspot Number 
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. Alania, M. V., Baranov, M. I., Tyasto, M. I., and Vernova, E. S.: 1999, Proceedings of the 26th ICRC, 7, 131.Google Scholar
  2. Ataç, T. and Özgüç, A.: 1996, Solar Phys. 166, 201.CrossRefADSGoogle Scholar
  3. Ataç, T. and Özgüç, A.: 2001, Solar Phys. 198, 399.CrossRefADSGoogle Scholar
  4. Bai, T.: 2003, Astrophys. J. 591, 406.CrossRefADSGoogle Scholar
  5. Bai, T. and Sturrock, P. A.: 1991, Nature 350, 141.CrossRefADSGoogle Scholar
  6. Ballester, J. L., Oliver, R. and Carbonell, M.: 2004, Astrophys. J. 615, L173.CrossRefADSGoogle Scholar
  7. Bazilevskaya, G. A., Krainev, M. B., Makhmutov, V. S., Flückiger, E. O., Sladkova, A. I., and Storini, M.: 2000, Solar Phys. 197, 157.CrossRefADSGoogle Scholar
  8. Bonev, B. P., Penev, K. M., and Sello, S.: 2004, Astrophys. J. 605, L81.CrossRefADSGoogle Scholar
  9. Caballero, R. and Valdés-Galicia, J. F.: 2001, Adv. Space Res. 27, 583.ADSGoogle Scholar
  10. Feminella, F. and Storini, M.: 1997, Astron. Astrophys. 322, 311.ADSGoogle Scholar
  11. Fröhlich, C. and Lean, J.: 1998, Geophys. Res. Lett. 25, 4377.CrossRefADSGoogle Scholar
  12. Gigolashvili, M. Sh., Mdzinarishvili, T. G., Japaridze, D. R., and Chargeishvili, B. B.: 2003, New Astron. 8, 529.ADSGoogle Scholar
  13. Gnevyshev, M. N. and Ohl, A. I.: 1948, Astron. Zh. 25,18.Google Scholar
  14. Gnevyshev, M. N.: 1963, Soviet Astron. 7, 311.ADSGoogle Scholar
  15. Gnevyshev, M. N.: 1967, Solar Phys. 1, 107.CrossRefADSGoogle Scholar
  16. Gnevyshev, M. N.: 1977, Solar Phys. 51, 175.CrossRefADSGoogle Scholar
  17. Gosling, J. T.: 1993, J. Geophys. Res. 98, 937.Google Scholar
  18. Haber, D. A., Hindman, B. W., Toomre, J., Bogart, R. S., Larsen, R. M., and Hill, F.: 2002, Astrophys. J. 570, 855.CrossRefADSGoogle Scholar
  19. Hady, A. A.: 2002, Planet. Space Sci. 50, 80.Google Scholar
  20. Hathaway, D. H.: 1996, Astrophys. J. 460, 1027.CrossRefADSGoogle Scholar
  21. Hathaway, D. H., Wilson, R. M., and Reichmann, E. J.: 2002, Solar Phys. 211, 357.CrossRefADSGoogle Scholar
  22. Hathaway, D. H., Nandy, D., Wilson, R. M., and Reichmann, E. J.: 2003, Astrophys. J. 589, 665.CrossRefADSGoogle Scholar
  23. Ishkov, V.: 2003, in: A. Wilson (ed.), ESA SP- 535, 103.Google Scholar
  24. Javaraiah, J.: 2003, Astron. Astrophys. 401, L9.CrossRefADSGoogle Scholar
  25. Joshi, B. and Joshi, A.: 2004, Solar Phys. 219, 343.ADSGoogle Scholar
  26. Kahler, S. W.: 1992, Annu. Rev. Astron. Astrophys. 30, 113.CrossRefADSGoogle Scholar
  27. Kleczek, J.: 1952, Publ. Centr. Inst. Astron. No. 22, Prague.Google Scholar
  28. Komitov, B. J. and Bonev, B.: 2001, Astrophys. J. 554, L119.CrossRefADSGoogle Scholar
  29. Knoška, S. and Petrásek, J.: 1984, Contrib. Astron. Obs. Skalnaté Pleso 12, 165.ADSGoogle Scholar
  30. Lambour, R. L., Coster, A. J., Clouser, R., Thornton, L. E., Sharma, J., and Cott, T. A.: 2003, Geophys. Res. Lett. 30, 36-1.CrossRefGoogle Scholar
  31. Li, K. J., Schmieder, B., and Li, Sh. Q.: 1998, Astron. Astrophys. Suppl. Ser. 131, 99.ADSGoogle Scholar
  32. Li, K. J., Wang, J. X., Xiong, S. Y., Liang, H. F., Yun, H. S., and Gu, X. M.: 2002, Astron. Astrophys. 383, 648.CrossRefADSGoogle Scholar
  33. Li, K. J., Liu, X. H., Zhan, L. S., Liang, H. F., Zhao, H. J., and Zhong, S. H.: 2003, New Astron. 8, 655.ADSGoogle Scholar
  34. Livingston, W.: 2002, Solar Phys. 207, 41.CrossRefADSGoogle Scholar
  35. Lou, Y. Q., Wang, Y. M., Fan, Z., Wang, S., and Wang, J. X.: 2003, Monthly Notices Royal. Astron. Soc. 345, 809.CrossRefADSGoogle Scholar
  36. Maris, G., Popescu, D. M., and Mierla, M.: 2002, Rom. Astron. J. 12, 131.Google Scholar
  37. Oliver, R. and Ballester, J. L.: 1994, Solar Phys. 152, 481.CrossRefADSGoogle Scholar
  38. Özgüç, A., Ataç, T., and Rybák, J.: 2002, J. Geophys. Res. 107, 10.1029/2001JA009080.Google Scholar
  39. Rieger, E., Share, G. H., Forrest, D. J., Kanbach, G., Reppin, C., and Chupp, E. L.: 1984, Nature 312, 623.CrossRefADSGoogle Scholar
  40. Rybansky, M.: 1975, Bull. Astron. Inst. Czechosl. 26, 367.ADSGoogle Scholar
  41. Scargle, J. D.: 1982, Astrophys. J. 263, 835.CrossRefADSGoogle Scholar
  42. Scherrer, H. P., Wilcox, M. J., Svalgaard, L., Duvall, L. T., Dittmer, H. P., and Gustafson, E. K.: 1977, Solar Phys. 54, 353.CrossRefADSGoogle Scholar
  43. Schatten, K. H.: 2003, Adv. Space Res. 32, 451.ADSGoogle Scholar
  44. Storini, M., Bazilevskaya, G. A., Flückiger, E. O., Krainev, M. B., Makhmutov, V. S., and Sladkova, A. I.: 2003, Adv. Space Res. 31, 895.ADSGoogle Scholar
  45. Temmer, M., Veronig, A., and Hanslmeier, A.: 2002, Astron. Astrophys. 390, 707.CrossRefADSGoogle Scholar
  46. Wang, Y. M., Sheeley, Jr. N. R., and Andrews, M. D.: 2002, J. Geophys Res. 107, 1465.Google Scholar
  47. Webb, D. F.: 1995, Rev. Geophys. Suppl. 95RG00345, 577.ADSGoogle Scholar
  48. Zhao, J. and Kosovichev, G. A.: 2004, Astrophys J. 603, 776.CrossRefADSGoogle Scholar
  49. Zieba, S., Maslowski, J., Michalec, A., and Kulak, A.: 2001, Astron. Astrophys. 377, 297.ADSGoogle Scholar
  50. Zwaan, C.: 1985, Solar Phys. 100, 397.CrossRefADSGoogle Scholar

Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Kandilli Observatory and E. R. I.Boğaziçi University CengelkoyIstanbulTurkey

Personalised recommendations