Fig. 9From: Modelling of geomagnetically induced currents in the Czech transmission gridTwo examples of the directional analysis for the 1-V/km uniform geoelectric field. The amplitudes of the GIC at the given substation are plotted in the polar plot. The red and blue colours indicate positive and negative GIC values, respectively. The azimuth of 0 indicates the northbound field, value of 90 indicates the eastbound fieldBack to article page