Sadly I didn't have my camera with me for this when skiing a week or so
back in Val d'Isere, so this was taken by a friend on a point and shoot.
(SLRs are a bit big for skiing!)
Its caused by refraction through ice crystals in the cirrus cloud and
Sun dog - Wikipedia, the free encyclopedia and have good descriptions.
it a much tighter circle than an ordinary rainbow (44 degrees !)
1 Original
(In fact looked far more rainbowy in actual life, though I was
looking through pinkish goggles
2. Slight Photoshopping
3. Heavier photoshopping
(80% saturation)