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Table 3.
Error and correlation statistics for the Sauer & Wilkinson, 2008 PCA model (DRAP) based on 14 riometers and all 94 SPEs (1995–2005) for both original and optimised parameter sets. The Smart et al. (1999) CL model is used (with an optional equatorward shift of Δλ).
| S&W (2008) | Optimised parameters |
||||
|---|---|---|---|---|---|
| mn, md | mn, md, Etn, Etd | mn, md, Etn, Etd, Δλ | mn, md, Etn, Etd, Δλ, n, χc, Δχ, S, C, D | ||
| mn (dB pfu−0.5) | 0.020 | 0.017 | 0.017 | 0.015 | 0.045 |
| md (dB pfu−0.5) | 0.115 | 0.080 | 0.085 | 0.077 | 0.25 |
| Etn (MeV) | 2.2 | – | 2.36 | 1.54 | 2.42 |
| Etd (MeV) | 5.2 | – | 6.83 | 5.07 | 9.25 |
| Δλ (°) | – | – | – | 3.18 | 2.09 |
| n | 0.5 | – | – | – | 0.38 |
| χc (°) | 90 | – | – | – | 90.1 |
| Δχ (°) | 10 | – | – | – | 10.6 |
| S (dB) | 0 | – | – | – | −0.050 |
| C (dB) | 0 | – | – | – | −0.017 |
| D (dB) | 0 | – | – | – | −0.12 |
| RMSE (dB) | 0.964 | 0.757 | 0.753 | 0.675 | 0.620 |
| Reduction in RMSE (%) | – | 21.5 | 21.9 | 30.0 | 35.7 |
| Bias (dB) | 0.081 | −0.22 | −0.23 | −0.11 | 0.0065 |
| Mean % overestimate | 16 | −12 | −14 | 9.2 | 34 |
| Mean abs. error (dB) | 0.496 | 0.439 | 0.434 | 0.486 | 0.370 |
| Correlation coefficient | 0.832 | 0.829 | 0.834 | 0.827 | 0.872 |
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