Fig. 4From: Measurement of geomagnetically induced current (GIC) around Tokyo, Japan0.1-s data of GICs at SFJ, STB, and SFS and X- and Y-components of geomagnetic and geoelectric fields at KAK of the 20 April 2018 geomagnetic storm. Vertical dotted lines show the excursions of GICs noted in the textBack to article page