Definitions

halo-like

Circumscribed halo

A circumscribed halo is a halo, an optical phenomenon which circumscribes a 22° halo centred around the sun.

When observed, a circumscribed halo is normally oval in shape and tangential to the 22° halo directly under and above the sun. It form when sun rises and the upper tangent and lower tangent arcs extends into each other and closes in on the 22° halo. As the sun rises above 70° it basically covers the 22° halo.

A circumscribed halo is generally weaker than but more intensive in colour than the 22° halo. Like many other halos, it is reddish on the inner edge facing the sun while bluish on the outer edge.

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