ice halos and other optics

Non-spotted Wegener arc

Not seeing a colored Wegener when it is there can hollow a halo man up. Just that’s what happened today. There was a nice little display little in cirrus and I found Wegener from the photos afterwards. It is actually rather typical for me to not see them.  Curious incidence was that I took a panorama of the same clouds earlier when they were closer to horison and not yet at halo making distance. I did not expect them to show anything special.

Hugin is good now for halo panoramas as it gives 16 bit output. I put here also two different projections of the cirrus cloud panorama. The first is cylindrical and sencond is rectililnear. The rectilinear represents the clouds more like they appeared to the eye, being straight stripes.


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