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Fig. 13.


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Measurements of the auroral electrojet, based on data from the IMAGE magnetometer network (Amm & Viljanen 1999). The top panel shows the current as a function of time and latitude. The longitude is constant at 22° E. The middle panel emphasizes strong currents by showing only current densities exceeding 200 A/km, and using a different color scale. The bottom panel shows the total eastward and westward electrojet currents, integrated over all latitudes.

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