From SpaceWeather.com
https://www.spaceweather.com/
A RED ARC OVER SWEDEN:
You've heard of auroras--green and purple lights that dance in the sky during geomagnetic storms. But have you ever heard of an SAR? Stable Auroral Red arcs (SARs) were discovered in 1956 at the beginning of the Space Age and have been recorded by cameras on satellites hundreds of times since.
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