Table 2
xDIFI-2 model mean (μ) and root-mean-square (σ) residuals, and number of data points (N), for Swarm Alpha, Swarm Bravo, and CHAMP satellite data (within quasi-dipole latitudes of ±55°), as well as observatory data used in the inversion and validation. Residuals are provided for the radial (r), polar (θ), and azimuthal (φ) components of the magnetic field. For satellite data, residuals are computed only in the domain of validity, defined by quasi-dipole latitudes within ±55°.
| N | μr (nT) | σr (nT) | μθ (nT) | σθ (nT) | μφ (nT) | σφ (nT) | |
|---|---|---|---|---|---|---|---|
| xDIFI-2 | |||||||
| All Satellites | 907,837 | 0.05 | 3.83 | 0.57 | 5.06 | −0.09 | 9.07 |
| Alpha | 366,274 | 0.01 | 3.58 | 0.45 | 4.75 | −0.22 | 8.92 |
| Bravo | 352,430 | −0.08 | 3.44 | 0.49 | 4.64 | −0.17 | 8.70 |
| CHAMP | 189,133 | 0.35 | 4.83 | 0.99 | 6.26 | 0.30 | 9.98 |
| Obs. Inversion | 1,989,266 | −0.08 | 5.99 | 0.12 | 6.87 | −0.07 | 6.60 |
| Obs. Validation | 2,831,118 | −0.39 | 6.72 | −1.32 | 9.75 | 0.03 | 8.53 |
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