photojojo:

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

(via heavysky)