22° Halo

When flying into Manchester Airport last week on my way to the Sheffield LUG Seminar I noticed a rainbow coloured circle (actually, only a part of a circle) around the sun. I think it's part of a 22° circular halo although I'm not sure. You can clearly see that it's darker inside the "circle". What is also unknown is why there is this bright white ray directly between the Sun and the Earth (the image is a bit rotated, so that's why it's not straight down).
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