High Sun Halos imaged
by Laurent Laveder (site, Sky
in France. ©Laurent
Laveder, shown with permission.
The inner circular halo is the familiar 22
Surrounding it and touching at top and bottom is a circumscribed halo.
At low sun there are two tangent arcs.
As the sun climbs they join to
form the circumscribed halo, initially a drooping oval shape. At
higher sun the oval tightens and
eventually it is almost circular. When nearly circular It is
often mistaken for the less colourful 22 degree halo.