Solar Activity Indices in the Cycles 21–23

  • A. A. Borisov
  • E. A. Bruevich
  • I. K. Rozgacheva
  • G. V. Yakunina
Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP, volume 30)


A stable cyclicity of correlation coefficients K corr for some solar activity indices versus F 10.7 was found after monthly averages values analysis. These indices are: Wolf numbers, 10.7 cm radio flux F 10.7, 0.1–0.8 nm background, the total solar irradiance (TSI), Mg II UV-index (280 nm core to wing ratio) and monthly flare count/10. The correlation coefficients of the linear regression of these solar indices versus F 10.7 were analyzed for every year in solar cycles 21, 22 and unusual cycle 23. We found out that the values of yearly determined correlation coefficients K corr for solar activity indices versus F 10.7 show the cyclic variations with stable period closed to half length of 11-year cycle.


Solar Activity Solar Cycle Total Solar Irradiance Solar Activity Cycle Wolf Number 
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The authors thank the RFBR Grant 09-02-01010 and FCPK Grant N 16. 740. 11. 0465 for support of the work.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • A. A. Borisov
    • 1
  • E. A. Bruevich
    • 2
  • I. K. Rozgacheva
    • 1
  • G. V. Yakunina
    • 2
  1. 1.Moscow State Pedagogical UniversityMoscowRussia
  2. 2.Sternberg Astronomical Institute, MSUMoscowRussia

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