Saturday 10 April 2010

High sun parhelic circle

There are not much around photos of parhelic circle that fits inside the 22° halo. Here is one, seen over La Silla astronomical observatory in Chile on 27 January 1990. Sun is at 79 degrees elevation. Damien Hutsemekers, who took the photo, wrote also a report of the display ( 1 ). See some more photos ( 2 ).
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5 comments:

  1. Elmar Schmidt10 April 2010 at 12:40

    Thank you for this reminder of a classic (and rare!) observation. It would be interesting to have state of the art intensity vs. solar altitude simulations for the parhelic as well as for the CZA and CHA.

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  2. Michael10 April 2010 at 20:08

    Nice pics I like how you can see the infralateral arc and the circumhorizon arc separate from one another in the last pic.

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  3. marko riikonen10 April 2010 at 22:07

    In his paper Hutsemekers identifies there 46 halo and circumhorizon arc. I am bound to agree with him. Probably 46 infra is also playing invisible role, conbined with cha. Somebody should make a simutation.

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  4. Michael11 April 2010 at 05:01

    Yeah you're right marko CHA and infralateral arc always touch one another the CHA does not touch 46 halo at that elevation so I guess that must be a very well developed 46 halo because the 22 halo is very bright.

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  5. marko11 April 2010 at 11:54

    Here is even higher sun parhelic circle. Thanks for Patrik Trncak for finding this.

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