Fig. 3From: Penetration of the electric fields of the geomagnetic sudden commencement over the globe as observed with the HF Doppler sounders and magnetometersElectric fields of the PI and MI of the SC converted from the HF Doppler frequencies observed at PRG (49.4º GML) and TCM (-17.1º GML) on the nightside, and at SGD (27.9º GML) and ZHL (14.4º GML) on the dayside. The local time features meet the dusk-to-dawn PI and dawn-to-dusk MI electric fieldsBack to article page