Optical phenomenon
A halo display photo documented by Cindy McFee, NOAA, December 1980 at the South Pole Station. Several distinct halo phenomena are featured in the photo: Two sun dogs (bright spots), a parhelic circle (horizontal line), a 22° halo (circle), and an upper tangent arc and a Parry arc (top).
Complex Moon halo. Visible are: halo, Parry arc, upper tangent arc and Moon dogs.
Upper tangent arc and sunvex Parry arc seen over Santa Rosa Beach, Florida.
A Parry arc is a rare halo, an optical phenomenon which occasionally appears over a 22° halo together with an upper tangent arc.
