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Fig. 4


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The 6 panels display the differential equivalent currents determined from inspection of individual 10-second data with the FMI IMAGE website. The colour scale gives the intensity of the electrojet current density and the arrows its direction. Panels 1, 3 and 5 show the appearance (ON) of a localised FAC system in contrast to panels 2, 4 and 6 where it vanishes (OFF). The indicated times refer to the interval chosen for the subtraction of the initial and final total equivalent currents to obtain the differential equivalent currents.

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