Orange Aurora
Taken by Jonathan Harmon on August 11, 2024 @
Shenandoah National Park, VA
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Details:
My two cents on the orange aurora. While teaching 5th grade students about light at my planetarium, I would do a demonstration using three primary color light projectors, red, green and blue. Unlike pigment mixed colors (subtractive), mixed light (addiitiive) has surprisingly different results. When arranging the three primary beams evenly and overlapping each other, the green and red overlap shockingly, to the students produced yellow. By lessening the intensity of the green, the mixed overlap turns orange. Clearly during an auroral display, there can be, from an observers line of sight varying degrees of red/green mixing (the most common auroral colors) producing a color gamut from yellow to orange. See accompanying photo diagram and examples.
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