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Fig. 6 | Earth, Planets and Space

Fig. 6

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

Fig. 6

Inversion from geomagnetic measurements at cut-off 1.04 mHz to determine the parameters of ionospheric currents. “Initial” in the legend refers to the initial estimate to start the inversion. “Final” refers to the inversion result for the same parameter at this cut-off frequency. The residuals (bottom plots) are the difference between the inversion results and the measured values (upper plots: circles) at the locations of Adigrat [678.6 km] and Addis Ababa [95.8 km north of the EEJ] along the geographic meridian

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