This is a spooky photograph I took out of the window of a jet coming back from a guest lecturing stint at a Swiss university a while back. It’s been cropped and enhanced slightly to show the sun and jet more clearly; the non-enhanced version is below.
What it shows is the shadow of the plane I’m in and the disc of the sun behind it. But the image is taken looking away from the sun, which is above and behind the jet. So, why can the sun be seen rather than just the jet’s shadow? It must be a weird atmospheric effect whereby the sun is reflected in the clouds.
The enhanced version makes it look as if there is a faint rainbow around the sun disc.
The effect was visible for several minutes, certainly long enough to get my camera out and take the photo.