Anticorona

Anticorona is a halo of light, it occurs at the point opposite a source of light (like sun). It is made of one or more colored “rainbowy” rings that appear around the shadow cast by an observer on a cloud or in fog. It’s a luminous edging around the shadow of an observer on the point where his or her shadow would fall, as thrown by the sun upon a cloud or fog bank.

Anticorona is also known as Spectre of Brocken, Brocken bow (named for a foggy mountain in Germany, where hikers often observed their shadows on a fog below), or mountain spectre.