Table 5.
Best fit parameters between the annual median values of CEA20 plage area composite and annual median values of various sunspot series.
| pa = a1 + a2 × sa3 |
||||
|---|---|---|---|---|
| a1 | a2 | a3 | RSS/d.o.f. | |
| Power law | ||||
| MEA20 | 0.007 ± 0.001 | 0.0176 ± 0.0013 | 0.78 ± 0.06 | 0.68 |
| ISNv1 | 0.005 ± 0.001 | 0.0049 ± 0.0009 | 0.87 ± 0.06 | 0.58 |
| ISNv2 | 0.005 ± 0.001 | 0.0048 ± 0.0008 | 0.94 ± 0.07 | 0.69 |
| CEA17 | 0.005 ± 0.001 | 0.0029 ± 0.0007 | 1.12 ± 0.10 | 0.66 |
| SvSc16 | 0.005 ± 0.001 | 0.0038 ± 0.0009 | 1.03 ± 0.09 | 0.67 |
| Squared root | ||||
| MEA20 | 0.0018 ± 0.0008 | 0.0247 ± 0.0008 | 0.5 | 0.96 |
| Linear | ||||
| MEA20 | 0.0090 ± 0.0006 | 0.0137 ± 0.0004 | 1 | 0.77 |
| ISNv1 | 0.000 ± 0.000 | 0.0070 ± 0.0007 | 1 | 0.61 |
| ISNv2 | 0.000 ± 0.000 | 0.0062 ± 0.0006 | 1 | 0.70 |
| CEA17 | 0.000 ± 0.000 | 0.0040 ± 0.0007 | 1 | 0.67 |
| SvSc16 | 0.000 ± 0.000 | 0.0044 ± 0.0007 | 1 | 0.67 |
Notes. RSS/d.o.f. are the sum of the squared residuals per degree of freedom. The ISNv1 and ISNv2 sunspot number values were divided by 12.08 (ISNv2 values are also multiplied by 0.6) prior to the fit to bring them roughly to the same level as the group sunspot number series.
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