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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Penetration of the electric fields of the geomagnetic sudden commencement over the globe as observed with the HF Doppler sounders and magnetometers

Fig. 6

SCs recorded in the X- and Y-components of the magnetic field at the IMAGE magnetometer array stations deployed in the morning sector (07 MLT) from the polar cap, Ny Alesund (NAL, 75.25º CGML) to middle latitude, Tartu (TAR, 54.47º CGML). The PI in X is positive at lower latitudes, while negative at higher latitudes from Bear Island (BJN, 71.45º CGML). In contrast, the PI in Y is positive at all stations. The latitudinal features of the X and Y meet the dawnside part of the counter-clockwise Hall current vortex surrounding the upward FAC

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