Circumzenithal arc
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The circumzenithal arc, also called the circumzenith arc, the upside-down rainbow, and the Bravais arc, is an optical phenomenon similar in appearance to a rainbow, but belonging to the family of halo
A circumzenithal arc in Salem, Massachusetts, Oct 27, 2012. Also visible are a supralateral arc, Parry arc (upper suncave), and upper tangent arc.
From top to bottom: a circumzenithal arc on top of a 46° halo, on top of a Parry arc, on top of a tangent arc, on top of a 22° halo, on top of the actual sun.
A Circumzenithal Arc. Seen in Mount Vernon, Washington. : June 10, 2024
Parry arc
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A Parry arc is a rare halo, an optical phenomenon which occasionally appears over a 22° halo together with an upper tangent arc.
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.