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Dear all,
I have made a simulation that shows ordinary halos and halos from
reflected light for sun elevations of 5,10 and 15 degree. The best
chance to see a reflected upper tangent arc is a sun elevation of about
5 degree. The 22 degree halo in reflected light should also be visible.
For these simulations I combined two simulations with the HALO program
by Les Cowley and Michael Schroeder, e.g. one for 10 deg and the other
with -10 degree.
Adress:
http://members.tripod.com/~regenbogen/results/refl.htm
The upper tangent arc looks very similar to the Moilanen arc with a sun
elevation of 5 degree. But I think this explenation has already been
excluded. I read about a Moilanen arc photographed by Rainer Vilkkilä.
The sun elevation was about 3.3 degree and the distance of the arc to
the sun was about 11 degree. These measurement did not fit to a
reflected upper tangent arc.
Regards,
Mark Vornhusen
AKM Homepage: http://www.meteoros.de
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