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Fig. 6


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Kevo (KEV) All-Sky Camera images on March 17, 2015, between 17:46:00 and 17:47 UT (third BX spike). The colour scale represents the difference in count rate between two consecutive images (20 s). We observe a brightening of the auroral emission (middle panel red colour) during the third enhancement of the westward electrojet in the north of Fennoscandia.

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