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Fig. 4.


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This figure contains a subset of the data shown in the two panels (a) and (b) of Figure 3. (a) ROTI, filtered to show only strong disturbances. (b) East-West currents, filtered to show only strong currents. The dashed black line shows the location of MLT midnight. The dashed magenta lines are visual aids drawn on the poleward edge of the poleward-moving westward electrojet.

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