Table 1. Mean (μ) and standard deviation (σ) of the differences in the X, Y and Z hourly mean values (QD—definitive) at five IMOs for all years analysed.
From: A method for the near real-time production of quasi-definitive magnetic observatory data
| Â | X (North) | Y (East) | Z (Vertical) | |||
|---|---|---|---|---|---|---|
|  | ζ (nT) | σ (nT) | ζ (nT) | σ (nT) | ζ (nT) | σ (nT) |
LER | 0.9 | 2.6 | −1.0 | 3.1 | 0.3 | 1.1 |
ESK | −0.5 | 1.6 | −0.4 | 1.0 | 0.1 | 1.0 |
HAD | 0.3 | 1.5 | 0.1 | 1.5 | 0.2 | 1.1 |
ASC | −0.3 | 1.8 | 0.3 | 3.8 | −0.5 | 1.2 |
PST | 0.2 | 2.6 | 0.9 | 3.5 | 2.1 | 3.2 |