Earth and Planetary Science
EPS Near-Surface Geochemistry and Geobiology

Sun Halos Over UC Berkeley

Thursday, October 5, 2017

Sun Halos Over UC Berkeley

During the final weeks of September, Students, Staff, and Faculty were wowed by the appearance of halos around the Sun over campus.

Referred to as  “22 degree halos”, these halos form when light from the Sun (or Moon) is refracted through ice crystals located in high-level clouds.[1]

Although a spectacular sight, these halos are not that rare for the area.

As a matter of fact, Moon halos are often quite visible in the Bay Area during winter nights when there is an approaching storm.

Click the following link for more information about “22 degree halos”: