Multiple halos near ski hill
Taken by Diana P. on December 29, 2014 @ Bromont, QC, Canada
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The sun never rose very high above the Bromont ski hill, and the snow cannons were on at full blast. All day long we saw bits of halos, sometimes very bright and colorful! That afternoon we spotted parhelia, a partial 22 degree halo, a CZA, and a supralateral arc. There are however two arcs I don't recognize: 1. In the 1st picture, the arc between the parhelion and the very colorful supralateral - is it a far-reaching upper tangent arc? 2. In the 1st and 2nd pictures, the parhelia have two arcs pointing up from them. I also wonder which arc going through the parhelia is the 22 degree halo, as the brightest arc seems to have a dip. Unfortunately I couldn't calculate the solar elevation because I don't remember the time each picture was taken (sometime in the mid-afternoon) and the camera time setting was wrong. Nonetheless it was a memorable halo day!
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Compliments for these images! The points:
1. The arc between parhelion and 46degs supralateral is a far-reaching extension of the 22degs upper tangent arc, possibly together with the contacting suncave Parry arc.
2. I guess both arcs are to be determined as Lowitz arcs, the longer (right hand) one being the upper variant and the shorter one being the upper section of the lower variant. The upper one is tangent to the 22degs ring which I do not find itself in the pictures.
Posted by pphv 2015-01-25 08:00:27
 
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