Fig. 4From: Penetration of the electric fields of the geomagnetic sudden commencement over the globe as observed with the HF Doppler sounders and magnetometersSCs recorded in the X- and Y-components at Husafell, Iceland (HUS) and College, Alaska (CMO), located in the pre-dawn (0410 MLT) and afternoon (1730 MLT), respectively. The X and Y are plotted with the solid and dotted curves, respectivelyBack to article page