Study of solar brightness profiles in the 18–26 GHz frequency range with INAF radio telescopes - I. Solar radius

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Table 6.

Values of the correlation coefficient ρ between the solar radius (calculated with the Grueff Radio Telescope) and the solar activity at radio frequencies characterised by a good temporal coverage.

Frequency	Type correlation	ECB	2GECB
(GHz)
18.3	R_c–sunspot	−	−
18.3	R_eq–sunspot	0.979	0.862
18.3	R_pol–sunspot	0.212	–0.785
18.3	R_eq–R_pol	0.253	−0.330

25.8	R_c–sunspot	−	−
25.8	R_eq–sunspot	0.763	0.474
25.8	R_pol–sunspot	0.167	−0.747
25.8	R_eq–R_pol	–0.419	0.082

Notes. R_⊙ is calculated through the ECB and 2GECB models described in Sect. 3.2. See the caption of Table 4 for a full description of the table.

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