Abstract
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.
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Acknowledgements
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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© 2012 Springer-Verlag Berlin Heidelberg
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Borisov, A.A., Bruevich, E.A., Rozgacheva, I.K., Yakunina, G.V. (2012). Solar Activity Indices in the Cycles 21–23. In: Obridko, V., Georgieva, K., Nagovitsyn, Y. (eds) The Sun: New Challenges. Astrophysics and Space Science Proceedings, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29417-4_20
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DOI: https://doi.org/10.1007/978-3-642-29417-4_20
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