The ring of light that seems to encircle the sun or moon when veiled by cirrus clouds. To produce this phenomena, the ice crystals must be in a heterogeneous arrangement to refract the sunlight. The most commonly observed is a halo that forms at a 22° radius, although another one at 46° radius may also be seen.
HALO
Meaning of HALO in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012