images

Halo around the Sun

by

David Miller/David Malin Images/Novapix

Reference

t-met03-00003

Date

2007-03-26

Halos are mostly caused by ice crystals in cold cirrus clouds located high (5–10 km, or 3–6 miles) in the upper troposphere. Tiny ice crystals create cercle around the Sun by refracting and reflecting light.