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Pink Aurora Over Crater Lake (July 25 2012) Image Credit & Copyright: Brad Goldpaint (Goldpaint Photography) Why is this aurora strikingly pink? When photographing picturesque Crater Lake in Oregon, USA last month, the background sky lit up with auroras of unusual colors. Although much is known about the physical mechanisms that create auroras, accurately predicting the occurrence and colors of auroras remains a topic of investigation. Typically, it is known, the lowest auroras appear green.