Source: https://www.youtube.com/watch?v=_TeJiwMAAgE
Original video here.
This video of the sun happens to catch a plane flying in front of it. You can see the heat from the engines distorting the image.
But a few seconds later you can also see another ripple pass over the sun. It's a quite thin local discontinuity, so I suspect it's the core of the wingtip vortices.
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