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I have seen the 46-degree halo in fresh snow and frosted snow several
times
in the Flagstaff Area. It is indistinct, with few appropriately oriented
crystals per angular area, so it helps to look at the snow surface as you
move along, thus bringing causing many crystals to traverse the proper
halo
angle w.r.t. observer and sun.
I think it may help in attempts at photography if you slightly defocus
your
camera. If you take in-focus images, the points of light representing the
halo will have such a high intensity relative to the mean for the scene
that the color will likely be lost in overexposure, though the exposure
for
the scene is on average acceptable.
Chris
Christian B. Luginbuhl
U.S. Naval Observatory Flagstaff Station
Flagstaff Arizona 86002-1149 USA
Phone: 520-779-5132
Email: cluginbuhl_at_nofs.navy.mil
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