Table 5 Number N, Huber-weighted mean, and standard deviation \(\sigma\) computed from the residuals of the satellite data for each vector component and split into polar (poleward \(\pm 55^{\circ }\)) and non-polar (equatorward \(\pm 55^{\circ }\)) QD latitudes. Note that non-polar scalar data were not used in the model parameter estimation—statistics are only shown for completeness
Dataset | Quasi-dipole latitude | Component | N | mean (nT) | \(\sigma\) (nT) |
|---|---|---|---|---|---|
CHAMP | Non-polar | \(B_r\) | 707131 | 0.02 | 1.93 |
\(B_\theta\) | 707131 | − 0.11 | 2.84 | ||
\(B_\phi\) | 707131 | 0.03 | 2.32 | ||
F | 707131 | 0.01 | 1.93 | ||
Polar | F | 200084 | − 0.02 | 5.10 | |
CryoSat-2 FGM1 | Non-polar | \(B_r\) | 958362 | − 0.06 | 4.39 |
\(B_\theta\) | 958362 | − 0.31 | 5.76 | ||
\(B_\phi\) | 958362 | 0.06 | 6.49 | ||
F | 958362 | 0.06 | 4.18 | ||
Polar | F | 331097 | − 0.28 | 7.56 | |
CryoSat-2 FGM2 | Non-polar | \(B_r\) | 958362 | − 0.03 | 6.42 |
\(B_\theta\) | 958362 | − 0.29 | 6.01 | ||
\(B_\phi\) | 958362 | 0.07 | 6.55 | ||
F | 958362 | 0.18 | 4.86 | ||
Polar | F | 331097 | − 1.70 | 8.21 | |
CryoSat-2 FGM3 | Non-polar | \(B_r\) | 958362 | − 0.07 | 4.76 |
\(B_\theta\) | 958362 | − 0.23 | 5.71 | ||
\(B_\phi\) | 958362 | 0.04 | 6.80 | ||
F | 958362 | 0.12 | 4.35 | ||
Polar | F | 331097 | − 1.01 | 7.86 | |
GRACE-A | Non-polar | \(B_r\) | 1082071 | − 0.12 | 11.40 |
\(B_\theta\) | 1082071 | − 0.24 | 10.48 | ||
\(B_\phi\) | 1082071 | − 0.79 | 13.57 | ||
F | 1082071 | − 0.16 | 10.59 | ||
Polar | F | 356988 | 0.32 | 15.56 | |
GRACE-B | Non-polar | \(B_r\) | 997802 | − 0.30 | 11.77 |
\(B_\theta\) | 997802 | − 0.69 | 11.09 | ||
\(B_\phi\) | 997802 | − 0.68 | 12.35 | ||
F | 997802 | 0.02 | 11.53 | ||
Polar | F | 331516 | − 0.24 | 15.56 | |
Swarm-A | Non-polar | \(B_r\) | 817400 | − 0.03 | 1.65 |
\(B_\theta\) | 817400 | − 0.06 | 2.97 | ||
\(B_\phi\) | 817400 | − 0.02 | 2.59 | ||
F | 817400 | − 0.03 | 2.06 | ||
Polar | F | 218776 | 0.22 | 4.66 | |
Swarm-B | Non-polar | \(B_r\) | 809720 | − 0.09 | 1.63 |
\(B_\theta\) | 809720 | − 0.05 | 3.02 | ||
\(B_\phi\) | 809720 | − 0.04 | 2.61 | ||
F | 809720 | − 0.01 | 2.03 | ||
Polar | F | 218106 | 0.30 | 4.29 |