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Hi Claudia and Wolfgang,
That's a strange red arc.
It's curvature and symmetry doesn't seem to be right for a halo arc but it
is hard say anything sure about that when you have seen only one photo
which doesn't show too much.
However, I made a color scanning for the image you sent. It seems that
this strange arc has red light only. No green or blue peaks is revealed in
my scanning. This is not typical for halo arcs in images. Even the faint
supralateral arc in the image (down right from cza) shows peaks of green
and blue colors when I scanned it. Well, this "color curve scanning" I
used doesn't have too much scientific value but it does show this kind of
nice details...
I have attached my scanning result as a file unk_cc.jpg (notice that I
have to blur the image to reduce color noice of the original image).
Conclusion: I don't think it is a halo but I can't be sure. I just don't
know what it is.
Jarmo
> Hallo friends,
>
> on March 10 we observed a multiple halo phenomenon with 22°-halo,
> 22°-parhelia, faint upper tangent Arc, very bright circumzenithal arc,
> 46°-halo, parhelic circle and upper and lower Lowitz arcs. On 5
> photographs there is also an unknown arc above the Circumzenithal
> Arc (one of these is attached to this mail).
> The Sun's elevation was 19,2 deg. For this reason it cannot be the
> upper part of supralateral arc, which is located to a sun elevation from
>
> 10 deg above the circumzenithal arc at this Sun elevation.. Maybe it
> could be
> an iridescent cloud in stripe form but the observations from the last
> years show, that iridescent clouds in this distance are very rare.
>
> Do you have an idea???
>
> Best wishes
> Claudia & Wolfgang Hinz
> Chemnitz, Germany
>
> --
> ________________________________________________________________________
>
>
> Claudia & Wolfgang Hinz
> Private Homepage: http://www.freiepresse.de/home/wohin
> Homepage Atmosphaerische Erscheinungen: http://www.meteoros.de
> ________________________________________________________________________
>
>
>
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