Abstract
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, S 0o 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 I 5303 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, I 0 is the value of I 5303 corresponding to I α = 0 and K is a constant.
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Xanthakis, J. On a relation between the indices of solar activity in the photosphere and the corona. Sol Phys 10, 168–177 (1969). https://doi.org/10.1007/BF00146165
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DOI: https://doi.org/10.1007/BF00146165