These other-worldly coronas of light are a result of the Kopp Etchells Effect.
When the conditions are just right in the deserts of Afghanistan, sand in the air strikes titanium/nickel abrasion strips in the rotors of Chinook Helicopters.
Desert Halos: The Kopp Etchells Effect
Photo by U.S. Army/Sgt. Mike MacLeod, via The Atlantic In Focus
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