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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