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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
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