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Measurements of the geoelectric field components (North–South & East–West), the variation of the horizontal component (H) of the magnetic field and GIC (in amps) for 7–8 September 2017. (a) Lerwick; (b) Eskdalemuir; (c) Hartland; (d) GIC at Torness substation, East Scotland. Note the magnetic and geoelectric curves are offset from zero.
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