Table 3
Pearson correlation coefficients R and slopes of NmF2 related linear regression lines of α, β, and α/β for the period 1958–2022 (Fig. 12) and the shorter period 1996–2022 for TEC and NmF2 (Fig. 10). Furthermore, the corresponding Root Mean Square Errors (RMSE) and absolute as well as percentage values are given. Slope*, RMSE*: TEC units α [10−4 mTECU s−1 sfu−1], β [10−6 s−1], α/β [101 mTECU sfu−1].
| Ionosonde station | Parameter unit | Production coefficient α [104 m−3s−1sfu−1]/% | Loss coefficient β [10−6 s−1]/% | Ratio α/β [108 m−3sfu−1]/% | Radio flux F10.7 [sfu]/% |
|---|---|---|---|---|---|
| JR055 NmF2 1958–2022 | R | 0.85 | −0.78 | 0.89 | – |
| Slope | −0.78/−1.4 | 3.3/5.8 | −5.4/−5.0 | −4.4/−3.1 | |
| RMSE | 3.3/5.8 | 3.3/5.8 | 10.9/10.1 | 13.7/9.8 | |
| JR055 NmF2 1996–2022 | R | 0.90 | −0.83 | 0.93 | – |
| Slope | −4.5/−7.5 | 14.0/22.5 | −25.0/−21.8 | −17.4/−12.4 | |
| RMSE | 10.4/17.3 | 14.0/23.1 | 26.0/22.8 | 38.5/27.6 | |
| JR055 TEC 1996–2022 | R | 0.93 | 0.16 | 0.86 | – |
| Slope* | −8.7/−16.2 | 8.5/16.6 | −3.7/−22.2 | −17.4/−12.9 | |
| RMSE* | 2.6/29.0 | 7.9/21.7 | 4.4/19.5 | 38.4/ 28.5 | |
| BC840 NmF2 1958–2022 | R | 0.36 | −0.94 | 0.91 | – |
| Slope | −1.09/−1.7 | 3.7/4.5 | −4.6/−4.9 | −4.4/−3.1 | |
| RMSE | 1.8/2.8 | 7.8/9.6 | 11.5/ 12.3 | 13.7/9.8 | |
| TO536 NmF2 1958–2022 | R | 0.87 | −0.87 | 0.89 | – |
| Slope | −1.5/−2.2 | 2.0/1.9 | −3.9/−4.9 | −4.4/−3.1 | |
| RMSE | 3.1/4.5 | 8.7/8.2 | 10.7/13.5 | 13.7/9.8 |
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