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Table 4 SSCs/SIs with largest values of H-component geomagnetic field reported from KAK and maximum GICs associated with them between February 2017 and August 2020

From: Measurement of geomagnetically induced current (GIC) around Tokyo, Japan

Order Date & time (UT) Type Max. H (nT) Max. dH/dt (nT/s) GIC (A)
SFJ STB SFS
1 2017/07/16 05:59 SSC 70 0.75 3.21 2.65 NA
2 2017/06/16 08:33 SIa − 32 − 0.20 − 1.67 − 0.85 NA
3 2017/05/15 09:15 SIa − 30 − 0.20 − 2.12 − 1.23 NA
4 2017/07/02 10:29 SI 26 0.12 1.08 1.03 NA
5 2017/05/14 11:18 SI − 24 − 0.10 − 0.86 − 0.87 NA
6 2017/06/11 14:39 SI − 22 − 0.14 − 1.10 − 0.98 NA
7 2017/08/31 05:37 SSCa 22 0.41 NA 1.10 NA
8 2017/05/11 04:59 SIa − 21 − 0.24 − 1.34 − 0.80 NA
9 2017/05/27 15:30 SSC 19 0.09 0.32 0.76 NA
  2017/06/03 12:34 SIa − 19 − 0.18 − 1.13 − 0.90 NA
  2019/07/08 19:22 SI 19 0.16 NA 1.11 NA
  1. SSC: Storm Sudden Commencement; SI: Sudden Impulse; NA: Not Available
  2. aNegative variation