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Table 3.
Summary of regression results (global geomagnetic data).
| Index | Function | R 2 |
|---|---|---|
| SSN | linear | 0.27 |
| ln | 0.19 | |
| poly | 0.35 | |
| hyp | 0.20 | |
| exp | 0.26 | |
| Ap mean | linear | 0.078 |
| ln | 0.082 | |
| poly | 0.123 | |
| hyp | 0.081 | |
| exp | 0.069 | |
| Dst mean | linear | 0.05 |
| ln | 0.04 | |
| poly | 0.23 | |
| hyp | 0.04 | |
| exp | 0.04 | |
| Annual no. of days with Ap ≥ 40 | linear | 0.06 |
| ln | ||
| poly | 0.14 | |
| hyp | ||
| exp | 0.05 | |
| Annual no. of days with Dst ≤ −40 | linear | 0.08 |
| ln | ||
| poly | 0.22 | |
| hyp | ||
| exp | 0.07 |
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