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Earth, Planets and Space
Fig. 9 | Earth, Planets and Space

Fig. 9

From: Estimating ionospheric currents by inversion from ground-based geomagnetic data and calculating geoelectric fields for studies of geomagnetically induced currents

Fig. 9

East component of the geoelectric field on 31 May 2013. The spectrum (upper panel) of the geoelectric field at the surface of the Earth was determined from the Fourier integral of the equatorial electrojet. The time series of the geoelectric field (lower panel) was obtained by an inverse Fourier transform of the spectrum. Location: a Addis Ababa, b the EEJ

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