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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

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

Fig. 2

HF Doppler frequencies observed during the SC at Prague (PRG, 3.59 MHz) and Tucuman (TCM, 4.63 MHz) on the nightside (0545, 0025 MLT) and at Sugadaira (SGD, 5.006 MHz) and Zhongli (ZHL, 6.57 MHz) on the dayside (1345, 1250 MLT). The HF Doppler frequencies are composed of the negative PFD and positive MFD on the nightside, and vice versa on the dayside

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