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The correlation coefficients of the linear regression of six solar indicesversus F10,7 were analyzed in solar cycles 21, 22 and 23. We also analyzed theinterconnection between these indices and F10,7 with help of the approximationby the polynomials of second order. The indices we've studied in this paperare: Wolf numbers - W, 530,3 nm coronal line flux - F530, the total solarirradiance - TSI, Mg II UV-index 280 nm core-to-wing ratio, Flare Index - FIand Counts of flares. In the most cases the regressions of these solar indicesversus F10,7 are close to linear except the moments of time near to theminimums and maximums of 11-year activity. For the linear regressions we foundthat the values of correlation coefficients Kcorr(t) for the indices versusF10,7 and W show the cyclic variations with periods approximately equal to theto half length of 11-year cycle - 5,5 years approximately.

Correlation study of some solar activity indices in the cycles 21 - 23