Zero Order Glow & Rainbows ~
Seen by Dávid Hérincs at Egyházasrádóc, Hungary ©Dávid Hérincs
When there is a rainbow and rain is also falling around you, look sunwards. Often the sky there is suffused with light, golden or red when the sun is low. This is the 'zero order glow'.
Light passing through raindrops without being internally reflected forms the glow. But why a glow rather than a rainbow?