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Table 4 Estimated amplitudes of 100-year and 1000-year events

From: Extreme geomagnetic activities: a statistical study

  Storm SC Substorm
100-year event 750* ~ 1100 nT 160 ~ 230* nT 5000* ~ 6000 nT
1000-year event 1100* ~ 2200 nT 240 ~ 450* nT 6200* ~ 8500 nT
  1. Asterisks denote the probable values from the better fitted distributions