17th May '02 in Southern Florida by Tricia Tie-Shue.
The sun was nearly 80º high and the halo could therefore be
a circumscribed halo rather than
The two are difficult to tell apart when the sun is nearly overhead.
circumscribed halo has slightly sharper and more intense colours.
Also, look for other halos to help identify what crystals are in
the sky. A small parhelic circle inside
the halo or an infralateral arc
lower in the sky would indicate that horizontal
column crystals were present and that the halo was a circumscribed
halo. There is no sign of a parhelic circle in this image but the
case remains open!
©2002 Tricia Tie-Shue, reproduced with permission.