This is rad, supersonic (transonic really) shockwaves forming on a 767 engine nacelle, refracting the light.
https://youtu.be/K08Gc0tKWoA
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Local supersonic airflow is a known phenomenon on airliners, especially over the wing. Managing these was the focus of a lot of wartime work (yes...the Nazis) which was carried on in the UK and US afterwards.
