Saturday 16 September 2006

Circumscribed halo and pyramid halos in Sardinia


This display was captured by Jan Drahokoupil in Sardinia on 6. September. The 22° halo is surrounded by elliptical circumscribed halo. The small halo around the sun is 9° halo or 9° column arc (or both together). Simulations could give better clue. Later on the display changed and there were also 18° plate arcs.

More photos here.
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7 comments:

  1. Michael Ellestad16 September 2006 at 21:45

    Wow now thats splendid I wonder if there were any 24 degree column arcs?

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  2. Marko Riikonen16 September 2006 at 22:49

    That's what I've been wondering as well. Should make simulations.

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  3. Anonymous17 September 2006 at 21:21

    Wow, nice and clear display!

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  4. Jari Luomanen17 September 2006 at 21:56

    Yep, this one's a beauty. It would be great to see photos from the anthelic region also.

    Jari

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  5. Patrik Trncak18 September 2006 at 00:38

    Jari and all, yes, I found Wegener arcs on photos, but very very very faint! I must use extreme unsharp mask.

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  6. Marko Riikonen18 September 2006 at 12:52

    The photo besides Patrik's simulation shows also parhelia. I think sun is very close to the max sun elevation for parhelia. Would be nice to know the time and locations to count sun elevation. Patrik's simulation seems to be for lower sun elevation.

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  7. Patrik Trncak18 September 2006 at 16:17

    Yes, my simulation is wrong for sun elevation, but for show 46halo and wegener arc is adequate.

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