22 Degree Halo Above Portland, Oregon

November 16, 2008


Photographer: Gabriel Lombardi
Summary Author: Stu Witmer  Gabriel Lombardi

The photo above showing a sprightly 22 degree solar halo was captured over Portland, Oregon was captured on June 8, 2008 at (1:30 p.m. local time). Luckily, there was a cookbook on hand to block the Sun. Unlike many halo pictures, the colors here are bright and distinct -- the photo wasn't enhanced or modified in anyway. This halo persisted with varying brightness for several hours. Portland International Airport radar reported scattered cirrus clouds (cirrus) at 25,000 feet (7,600 m) altitude, where the temperature was about -22 F (-30 C). Sunlight refracted by randomly oriented, pencil-shaped hexagonal ice crystals produce 22 degree halos. Thanks to Melissa McCall for providing the camera.

Camera details: NIKON D40, f 3.5, ISO 200, focal length 27