Helicopter in the desert at night, Kopp–Etchells effect.

Helicopter in the desert at night, Kopp–Etchells effect, When a helicopter flies low to the ground in sandy environments, sand can strike the metal abrasion strip and cause erosion, which produces a visible corona or halo around the rotor blades.

A helicopter flying low over a desert landscape at night, stirring up clouds of sand that create a visible halo or corona effect around the rotor blades, a phenomenon known as the Kopp–Etchells effect. This scene is marked by the striking interaction between sand particles and the metal helicopter blades, ...