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Table 2
Linear regression line related decrease of ionospheric key parameters as slope per decade, Pearson correlation R with F10.7, and Root Mean Square Errors (RMSE) derived from data sets within the period 1996–2022.
| Ionosonde station | Parameter | NmF2 [1010 m−3] | foF2 [MHz] | TEC [TECU] | τ [km] | hmF2 [km] | F10.7 [sfu] |
|---|---|---|---|---|---|---|---|
| JR055 1996–2022 | R | 0.95 | 0.99 | 0.96 | 0.76 | 0.94 | |
| Slope | −14.0 | −0.7 | −4.6 | −25.6 | −12.1 | −17.4 | |
| RMSE | 27.4 | 1.5 | 8.1 | 24.5 | 22.0 | 38.5 | |
| BC840 2000–2022 | R | 0.95 | 0.98 | 0.99 | 0.49 | ||
| Slope | −41.1 | −1.8 | −9.0 | −15.9 | −26.9 | ||
| RMSE | 46.5 | 1.96 | 10.9 | 25.7 | 32.0 | ||
| TO536 2002–2022 | R | 0.97 | 0.95 | 0.98 | 0.79 | ||
| Slope | −10.0 | −0.5 | −5.8 | −25.7 | −13.7 | ||
| RMSE | 26.9 | 1.4 | 9.3 | 31.7 | 28.4 |
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