Home   OPOD   What's New    Rays & Shadows   Water Droplets   Rainbows   Ice Halos     Contents     Crystals     Frequent Halos     Infrequent Halos       Why infrequent?       46° Halo        Supra/infralateral       Parry Arcs         Images         1  2  3  4        Lowitz Arcs       Moilanen Arc       Kern Arc       120° Parhelia       44° Parhelia       Subhorizon Arcs       Pyramidal     Multiple Displays     Other Worlds     Observing Halos     HaloSim   High Atmosphere   Links & Resources   Search - Index   123456789012345678		Parry Arc II
		Sunvex and suncave Parry arcs. When the sun is less than 15° high look out for the rare sight of two Parry arcs above the tangent arc. The uncommon "sunvex" arc, so named because it is convex towards the sun, is best seen at solar altitudes of 7-12°. Its position relative to the suncave arc changes quickly as the sun's altitude alters. Artist Loren Hall pictured the two arcs on an early spring afternoon in 1991 at Rome, Georgia. The bright display also had a supralateral arc from singly oriented columns and plate crystals produced a coloured circumzenithal arc. The HaloSim simulation below matched the halos using a solar altitude of 11.7 °. Photo ©Loren Hall, shown with permission.

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