On a relation between the indices of solar activity in the photosphere and the corona

In the first part a new index of solar activity in the photosphere is introduced i.e. the areas index I_a defined with the help of the relation, where A and f are the total areas of the sunspots and faculae respectively corrected for foreshortening.In the second part a relation of the form: is proposed, where S represents the intensity of solar radio-emission in the frequency range 1000 f < 10000 MHz, i_f is the index of solar flares, S₀o is the corresponding value of s for I_a = 0 and K is a constant.In the third part a relation of the form: is proposed, where I5303 is the mean intensity of the coronal line 5303 Å for each quarter of the years 1954–1964, n_pf is the corresponding number of proton flares, I₀ is the value of I₅₃₀₃ corresponding to I = 0 and K is a constant.