Table 1.
Characteristics of GIC30 as a function of |dH/dt|30 at selected geomagnetic observatories. Columns (90–99% etc.) refer to a set of sorted |dH/dt|30 values. For example, the first column is for |dH/dt|30 belonging to the largest 10% of all values excluding the top 1%. For each observatory, we consider a specific grid model indicated below the observatory code. The three rows for each observatory contain the following information: range of |dH/dt|30, mean and standard deviation of GIC30, range of GIC30. The insert table gives corrected geomagnetic coordinates (CGM) calculated for the year 2002 (http://omniweb.gsfc.nasa.gov/vitmo/cgm_vitmo.html).
| Observatory grid | 90–99 | 99–99.9 | 99.9–99.99 | 99.99–100 | % |
|---|---|---|---|---|---|
| UPS | 6–23 | 23–90 | 90–248 | 248–637 | nT/min |
| Nordic | 0.8 ± 0.4 | 2.8 ± 1.3 | 7.6 ± 2.8 | 16.3 ± 6.8 | A |
| 0.2–5.1 | 0.7–11.4 | 3.2–25.4 | 9.7–38.9 | A | |
| NUR | 7–27 | 27–115 | 115–300 | 300–940 | nT/min |
| Nordic | 0.8 ± 0.4 | 2.8 ± 1.3 | 7.5 ± 2.8 | 15.5 ± 6.8 | A |
| 0.1–4.8 | 0.7–11.4 | 2.9–25.4 | 7.1–38.9 | A | |
| NUR | 7–27 | 27–115 | 115–300 | 300–940 | nT/min |
| Baltic | 0.5 ± 0.2 | 1.5 ± 0.9 | 4.4 ± 2.2 | 8.8 ± 2.9 | A |
| 0.1–2.8 | 0.3–7.1 | 1.5–14.5 | 3.1–13.7 | A | |
| ESK | 6–17 | 17–64 | 64–197 | 197–573 | nT/min |
| British | 0.4 ± 0.1 | 1.0 ± 0.5 | 3.2 ± 1.2 | 7.7 ± 2.9 | A |
| 0.1–1.4 | 0.3–4.7 | 1.1–7.9 | 3.4–13.5 | A | |
| HAD | 4–11 | 11–35 | 35–98 | 98–302 | nT/min |
| British | 0.4 ± 0.1 | 1.0 ± 0.5 | 3.1 ± 1.5 | 7.1 ± 2.8 | A |
| 0.1–2.3 | 0.2–5.1 | 1.1–12.1 | 3.3–13.5 | A | |
| FUR | 3–8 | 8–25 | 25–62 | 62–184 | nT/min |
| Continent | 0.2 ± 0.1 | 0.4 ± 0.2 | 1.1 ± 0.4 | 2.5 ± 0.8 | A |
| 0.0–0.6 | 0.2–1.5 | 0.5–2.5 | 1.4–4.3 | A | |
| AQU | 3–8 | 8–21 | 21–48 | 48–87 | nT/min |
| Continent | 0.2 ± 0.1 | 0.4 ± 0.2 | 1.1 ± 0.5 | 2.4 ± 0.9 | A |
| 0.0–0.6 | 0.1–1.9 | 0.2–2.7 | 0.5–4.3 | A | |
| AQU | 3–8 | 8–21 | 21–48 | 48–87 | nT/min |
| Nordic | 0.8 ± 0.6 | 2.3–2.0 | 6.1 ± 4.0 | 12.9 ± 8.5 | A |
| 0.0–7.2 | 0.1–16.0 | 0.1–23.8 | 1.3–38.9 | A | |
| Observatory |
CGM lat |
CGM lon |
|||
| NUR (Nurmijärvi, FI) | 56.9 | 102.1 | |||
| UPS (Uppsala, SE) | 56.5 | 95.8 | |||
| ESK (Eskdalemuir, UK) | 52.6 | 77.2 | |||
| HAD (Hartland, UK) | 47.6 | 74.7 | |||
| FUR (Fürstenfeldbruck, DE) | 43.4 | 86.8 | |||
| AQU (L’Aquila, IT) | 36.2 | 87.3 |
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