Friday, 9 June 2006

Wegener anthelic arcs in Ondrejov



Two days (8.6.2006 and 9.6.2006) in Prague and near neighbourhood was very good for halos. The best halo display had Martin Nekola in Ondrejov, he was seen nice Wegener arcs in high Sun elevation (approximately 55 degrees) as big X on anthelion side of Sun. Web site of some next Martin´s halo photos is here.

By Patrik Trncak
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14 comments:

  1. Michael Ellestad10 June 2006 at 02:04

    Wow very nice!!! all we have had is poorly formed common halos in Ohio USA. I did get rainbow with anticrepuscular rays a week ago though.

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  2. Jarmo Moilanen10 June 2006 at 10:40

    Congratulations Martin!

    Great X of Wegener arc!

    Is there a trace of Hastings arc on down right "leg" of the Wegener arcs X? It seems to split into two arcs. That lower could be a Hastings arc and upper Wegener arc.

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  3. Patrik Trncak10 June 2006 at 16:09

    Jarmo, I was say for Hastings arc too. But I think, it will first Hastings arc on cirrostratus...oh no, it is impossible..and in Czech? No...BUT I seen your comment now and I hope for it! Martin have better photos, I will ask for it.

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  4. Michael Ellestad10 June 2006 at 17:52

    Hasings arc? I don't think I saw any splitting of the arcs.

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  5. Patrik Trncak10 June 2006 at 19:53

    Better photos:
    http://zeus.asu.cas.cz/~ford/foto/halo/PHK2.jpg
    http://zeus.asu.cas.cz/~ford/foto/halo/PHK3.jpg

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  6. Patrik Trncak10 June 2006 at 21:43

    Here is simulation:
    http://halo.kvalitne.cz/ruzne/hast.jpg

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  7. Michael Ellestad11 June 2006 at 05:14

    I did a simulation of that display with singly and parry oriented columns and I can see seperation between hasting and wegener.

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  8. Claudia Hinz11 June 2006 at 19:05

    It's a wunderful phenomena, congratulation!!! But I think, the means Hasting is a cloud stripe. Sorry ;o)

    Best wishes
    Claudia

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  9. Patrik Trncak12 June 2006 at 10:58

    Claudia: no, it is Hastings arc. Jarmo, Marko: ok, I try normal (no fisheye) simulation.

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  10. Peter-Paul Hattinga Verschure12 June 2006 at 15:14

    What was seen nearby/around the sun? Only 22deg column arcs, or also 22deg Parry oriented halos?

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  11. Patrik Trncak12 June 2006 at 15:32

    To Peter: around the Sun was clouds (cumulus), but Martin have some photos from compact camera with fisheye. I hope for Parry.

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  12. Patrik Trncak12 June 2006 at 19:53

    Here is better simulation:
    http://halo.kvalitne.cz/ruzne/simul.jpg

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  13. Les Cowley12 June 2006 at 21:46

    Are you using HaloSim?

    If so it would be useful to post the simulation file so that we can run it too and we can also see what crystal parameters have been chosen.

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  14. Michael Ellestad13 June 2006 at 03:06

    are you sure thats hastings?

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