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grl29169-sup-0002-ms01.aviapplication/x-troff-msvideo24146KAnimation S1. An animation of the interhemispheric conjugate auroral images every 10 s obtained with the Watec all-sky cameras at Tjornes in Iceland and Syowa Station in Antarctica, from 2308 UT to 2325 UT on September 30, 2011.

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