Table 2
Summary of the F2 peak parameters residuals ΔfoF2 and ΔhmF2 between collocated COSMIC-2 and ionosonde measurements in absolute (ΔX = X RO – X ionosonde) and relative (ΔX (%) = (X RO – X ionosonde) × 100/(X ionosonde)) values. The dataset is subdivided into low/middle latitudes zones and daytime/nighttime conditions. Cells with orange and cyan shading show maximal and minimal values of the residuals mean, respectively.
| Absolute values |
Relative values (%) |
|||
|---|---|---|---|---|
| Mean | SD | Mean | SD | |
| hmF2 | ||||
| Low latitudes | 5.289 km | 22.181 km | 2.195% | 8.175% |
| Middle latitudes | 2.217 km | 13.725 km | 1.224% | 5.708% |
| Low latitudes, day (08–20 LT) | 7.793 km | 23.913 km | 3.238% | 8.775% |
| Low latitudes, night (20–08 LT) | 1.944 km | 19.170 km | 0.807% | 7.081% |
| Mid latitudes, day (08–20 LT) | 3.441 km | 12.960 km | 1.832% | 5.766% |
| Mid latitudes, night (20–08 LT) | 0.543 km | 14.567 km | 0.392% | 5.533% |
| foF2 | ||||
| Low latitudes | 0.405 MHz | 0.771 MHz | 11.355% | 18.205% |
| Middle latitudes | 0.479 MHz | 0.485 MHz | 14.049% | 14.789% |
| Low latitudes, day (08–20 LT) | 0.346 MHz | 0.897 MHz | 7.274% | 14.874% |
| Low latitudes, night (20–08 LT) | 0.483 MHz | 0.565 MHz | 16.548% | 20.565% |
| Mid latitudes, day (08–20 LT) | 0.528 MHz | 0.515 MHz | 12.909% | 13.085% |
| Mid latitudes, night (20–08 LT) | 0.418 MHz | 0.437 MHz | 15.492% | 16.610% |
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