Fig. 5
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Nyrölä (NYR) All-Sky Camera images on March 17, 201,5 between 17:30:30 and 17:33:00 UT (start of the first wedgelet signature in the differential equivalent currents). The colour scale represents the difference in the count rate between two consecutive images within 30 s. Red is showing the brightening of the auroral optical emission.
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