Table 4.
Values of the correlation coefficient ρ between the solar radius (calculated with the Grueff Radio Telescope through the HP method) and the solar activity at radio frequencies characterised by a good temporal coverage.
| Frequency | Type correlation | Modelling | Statistical | Statistical | Average ρ |
|---|---|---|---|---|---|
| (GHz) | (circle) | (elliptical) | |||
| 18.3 | Rc–sunspot | 0.780 | 0.779 | 0.776 | 0.778 |
| 18.3 | Req–sunspot | 0.913 | 0.836 | 0.913 | 0.887 |
| 18.3 | Rpol–sunspot | 0.547 | 0.786 | 0.588 | 0.640 |
| 18.3 | Req–Rpol | 0.728 | 0.979 | 0.749 | 0.819 |
| 25.8 | Rc–sunspot | 0.761 | 0.760 | 0.697 | 0.739 |
| 25.8 | Req–sunspot | 0.842 | 0.606 | 0.848 | 0.765 |
| 25.8 | Rpol–sunspot | –0.612 | 0.784 | –0.586 | −0.138 |
| 25.8 | Req–Rpol | –0.677 | 0.609 | –0.534 | −0.201 |
Notes. The green values in bold type indicate a strong correlation (|ρ|≥0.7), the black values in bold type indicate a moderate correlation (0.3 < |ρ|< 0.7), and the rest indicate a weak correlation (|ρ|≤0.3).
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