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Table 4
Pearson correlation coefficients R and linear models of NmF2 and foF2 from F10.7 including RMSE values using previous 11 years averaged peak density and critical frequency data covering the period 1958–1990 (Figs. 13 and 14).
| Ionosonde station | Variable | Unit | Linear function f | Correlation R | RMSE |
|---|---|---|---|---|---|
| f = f(F10.7) | |||||
| Juliusruh JR055 | NmF2 | 1010 m−3 | NmF2 = 0.78 × F10.7 − 20.31 | 0.98 | 1.035 |
| foF2 | MHz | foF2 = 0.031 × F10.7 + 3.68 | 0.97 | 0.033 | |
| Boulder BC840 | NmF2 | 1010 m−3 | NmF2 = 0.82 × F10.7 − 13.25 | 0.98 | 1.081 |
| foF2 | MHz | foF2 = 0.03 × F10.7 + 4.43 | 0.97 | 0.034 | |
| Kokubunji TO536 | NmF2 | 1010 m−3 | NmF2 = F10.7 − 20.0 | 0.98 | 1.239 |
| foF2 | MHz | foF2 = 0.036 × F10.7 + 4.5 | 0.97 | 0.048 |
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