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Table 3

Statistical analysis of chromospheric activity indicators fluxes.

X-index Y -index ρ2006 (a) (b) ρ2018
Hα Hβ 0.965 0.000006% 0.941 0%
Hα Ca II H 0.518 0.34% 0.490 0.01%
Hα Ca II K (0.438) (1.33%) 0.233 6.4%
Hα Ca II 0.494 0.5% 0.409 0.12%
Hα He I 4026 0.816 0.0004% 0.769 0%
Hα He I 4471 0.920 0.000018% 0.831 0%
Hα He I 5876 0.953 0.000006% 0.802 0%
Hα Na I 0.932 0.000012% 0.585 0.0003%
Hβ Ca II H 0.532 0.26% 0.459 0.027%
Hβ Ca II K (0.433) (1.43%) 0.212 9.26%
Hβ Ca II 0.489 0.6% 0.390 0.2%
Hβ He I 4026 0.821 0.0003% 0.831 0%
Hβ He I 4471 0.952 0.000006% 0.886 0%
Hβ He I 5876 0.948 0.000006% 0.901 0%
Hβ Na I 0.933 0.000012% 0.601 0.00018%
Ca II H Ca II K 0.928 0.000018% 0.771 0%
Ca II H He I 4026 0.597 0.07% 0.338 0.73%
Ca II H He I 4471 0.543 0.21% 0.379 0.26%
Ca II H He I 5876 0.517 0.3% 0.408 0.12%
Ca II H Na I 0.517 0.43% 0.520 0.004%
Ca II K He I 4026 0.511 0.38% 0.123 33%
Ca II K He I 4471 (0.422) (1.69%) 0.187 14%
Ca II K He I 5876 (0.409) (2.1%) 0.191 13%
Ca II K Na I (0.404) (2.2%) 0.327 0.94%
Ca II He I 4026 0.591 0.08% 0.268 3.37%
Ca II He I 4471 0.494 0.52% 0.336 0.76%
Ca II He I 5876 0.479 0.69% 0.344 0.63%
Ca II Na I 0.478 0.69% 0.479 0.014%
He I 4026 He I 4471 0.86 0.00009% 0.844 0%
He I 4026 He I 5876 0.842 0.00019% 0.808 0%
He I 4026 Na I 0.777 0.0011% 0.397 0.16%
He I 4471 He I 5876 0.943 0.000012% 0.919 0%
He I 4471 Na I 0.887 0.00005% 0.478 0.015%
He I 5876 Na I 0.947 0.000006% 0.536 0.002%
Na I D1 Na I D2 0.867 0.00001% 0.893 0%

Notes. In the third and fourth columns, we reported the Spearman coefficient ρ and the value of the probability of a null hypothesis for the dataset of 2006. In the last two columns we reported the same values for the dataset of 2018. Weak correlations are reported in brackets, no correlations are shown in boldface. (a) Rank correlation for two populations (b) P-value denotes the two-sided significance of its deviation from 0 by random chance, i.e. a small value indicates significant correlation.

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