Table 3
Comparison of statistical error results with previous studies. The first two columns represent the mean and STD in Ch21 derived from the differences between COSMIC-2 and ionosondes given by Cherniak et al. (2021; Ch21 hereafter). Columns 3 and 4 show the mean and STD of the data in this study, calculated in a way corresponding to that in Ch21. The last three columns show the average STD of COSMIC error under corresponding conditions, calculated from the COSMIC-ionosonde-model combination using the 3CH method.
| foF2/MHz | Mean_Ch21 | STD_Ch21 | Mean | STD | IRI | NeQuick | WACCMX |
|---|---|---|---|---|---|---|---|
| Low latitudes | 0.405 | 0.771 | 0.612 | 0.912 | 0.3995 | 0.3820 | 0.4321 |
| Middle latitudes | 0.479 | 0.485 | 0.496 | 0.743 | 0.1928 | 0.2890 | 0.2638 |
| Low latitudes, day | 0.346 | 0.897 | 0.694 | 1.005 | 0.4448 | 0.3998 | 0.4555 |
| Low latitudes, night | 0.483 | 0.565 | 0.523 | 0.779 | 0.3528 | 0.3647 | 0.4072 |
| Mid latitudes, day | 0.528 | 0.515 | 0.531 | 0.807 | 0.2241 | 0.3495 | 0.2918 |
| Mid latitudes, night | 0.418 | 0.437 | 0.465 | 0.675 | 0.1585 | 0.2302 | 0.2389 |
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