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Table 2 Historical hazardous events with SC-type transient GICs

From: Extreme geomagnetically induced currents

Date Record Notes
24 March 1940 dH > 273 nT at KAKa Second largest storm (dH = −661 nT) at KAK
13 November 1960 dH = 220 nT at KAKa GLE10b, 3rd largest 30 MeV SEPc
4 August 1972 Shortest transit time, GICd GLE24f, 8th largest 30 MeV SEPc
24 March 1991 dH = 202 nTf, GICg Largest 10 MeV SEPh
  1. aMagnetometer observations at Kakioka (Araki 2014)
  2. bSteljes et al. (1961)
  3. cCliver and Svalgaard (2004)
  4. dLanzerotti (1983)
  5. e http://neutronm.bartol.udel.edu/~pyle/GLE_List.txt (GLE stands for the ground level enhancement of neutron monitor counting rate caused by the most energetic SEP)
  6. fAraki (1997)
  7. gKappenman (2003)
  8. h http://umbra.nascom.nasa.gov/SEP/