Hevel's halo

From Glossary of Meteorology
(Redirected from 90° halo)



Hevel's halo

A historical halo candidate, of which no convincing photographic documentation is known.

The possibility of this halo is based on early drawings of what seems to be a faint white halo of 90° radius centered on the sun. But good theoretical support is lacking, and subsequent reports seem to be misidentifications of the subhelic arcs.