Fig. 4From: Regional-scale high-latitude extreme geoelectric fields pertaining to geomagnetically induced currentsTimes series of the geomagnetic north-south component of the magnetic field (B x ) observed by the blue station group (see Fig. 3) on October 30, 2003 (top panel). The computed geoelectric field magnitude at the blue group stations on October 30, 2003 (bottom panel)Back to article page