Aurora in Fresno County, California
On April 20th, 2018, a Class 2 Geomagnetic Storm hit the Earth, resulting in bright blue aurora borealis. Normally, this is visible only in higher latitudes, but these dancing purple aurora spikes showed up as far south as central California! The green tinted sky is either more aurora or airglow, a similar phenomenon, and the golden glow is probably light pollution captured from nearby cities. Originally, I believed the purple towers to also be airglow, but then learned of the geomagnetic storm and saw similar photos of the same phenomena from northern California which proved to me that it is indeed, aurora!
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