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Parry Arcs

Parry arcs were named after Sir William Edward Parry (1790 - 1855) who searched for the Northwest passage and described many halos.
Parry arcs are rare. There are sunvex and suncave Parry arcs visible as thin coloured bows touching the circumscribed halo. Their shape changes with solar elevation.


Suncave Parry arc at Trier on October 11th, 2006. The Parry arc is the uppermost arc, touching the wing-shaped upper tangent arc and the 22° halo. The lower image also shows the right parhelion. Canon Powershot S80, processed with Adobe Photoshop Elements.


The gallery below shows simulations of the suncave Parry arc at different sun elevations with HaloSim 3.6 by © Les Cowley and Michael Schroeder.

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