Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-02-27
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
9 pages, 4 figures, 2 tables
Scientific paper
The monthly average values of the main solar activity indices such as Wolf numbers (W), 10,7 cm radio flux (F10,7), 0,1-0,8 nm background, total solar irradiance and Mg II UV-index (280 nm core to wing ratio) were studied for 23 activity cycle. The correlation coefficients of linear regression for main solar activity indices versus F10,7 were analyzed for every year of 23 activity cycle. All the correlation coefficients for 23 activity cycle have the minimum values in 2001. We also analyzed the connection between monthly average values of the most popular indices W and F10,7 for 21, 22 and 23 solar activity cycles. The values of every year linear regression correlation coefficients for W versus F10,7 show the cyclic variations with period closed to half path of so-called 11-year period of solar activity.
Bruevich E. A.
Yakunina G. V.
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