Weather - Cloud iridescence: colorful rings in the sky

Cloud iridescence, also called irisation, is an optical atmospheric phenomenon that creates vibrant colors near the Sun or Moon. Resembling the sheen on soap bubbles or oil surfaces, these pastel or vivid mother-of-pearl hues typically appear along the edges of altocumulus, cirrocumulus, and lenticular clouds. Because the effect often drowns in intense solar glare, observers frequently use dark glasses or water reflections to see it. It is also found in rare polar stratospheric clouds known as nacreous clouds.

Source: Wikipedia