Table 1 Period ranges of pulsations of geomagnetic field
From: Measurement of geomagnetically induced current (GIC) around Tokyo, Japan
| Notation | Period range (sec.) |
|---|---|
| Pc1 | 0.2–5 |
| Pc2 | 5–10 |
| Pc3 | 10–45 |
| Pc4 | 45–150 |
| Pc5 | 150–600 |
| Pi1 | 1–40 |
| Pi2 | 40–150 |
From: Measurement of geomagnetically induced current (GIC) around Tokyo, Japan
| Notation | Period range (sec.) |
|---|---|
| Pc1 | 0.2–5 |
| Pc2 | 5–10 |
| Pc3 | 10–45 |
| Pc4 | 45–150 |
| Pc5 | 150–600 |
| Pi1 | 1–40 |
| Pi2 | 40–150 |