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circumzenithal arc

It arises from refraction of sunlight through horizontally-oriented ice crystals, generally in cirrus clouds, rather than from raindrops.
The light that forms the CZA enters an ice crystal through its flat top face, and exits through a side prism face. The refraction of almost parallel sunlight through what is essentially a 90-degree prism accounts for the wide color separation and the purity of color.
Its colors are purer than those of the rainbow because there is much less color overlap in its formation.

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File information
Album name:Beryl / All sorts
Rating (2 votes):7777777777
Keywords:circumzenithal / arc
Camera:Nikon D50
Photo Location:Exmouth
Critique Welcome, Yes / No:No Thanks
Filesize:50 KiB
Date added:Feb 02, 2010
Dimensions:1024 x 768 pixels
Displayed:57 times
Color Space:sRGB
Digital Zoom Ratio:1
EXIF Image Height:768 pixels
EXIF Image Width:1024 pixels
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Exposure Program:Unknown: 0
Exposure Time:1/1250 sec
Flash:No Flash
FlashPix Version:version 1
Focal length:70 mm
Gain Control:0
Make:Nikon Corporation
Metering Mode:Pattern
Model:NIKON D80
Resolution Unit:Inch
Scene Capture Mode:0
Software:Adobe Photoshop CS3 Windows
Y Resolution:300 dots per ResolutionUnit
YCbCrPositioning:Datum Point
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Comment 1 to 12 of 12
Page: 1

roguesgallery   [Feb 02, 2010 at 01:44 AM]
Very interesting - thanks for sharing - don't think I've ever seen one of these before
Simple   [Feb 02, 2010 at 02:42 AM]
Ditto, Thanks Beryl. never heard of this before.
alan1j   [Feb 02, 2010 at 03:16 AM]
Well I've looked and looked but can't find a bird sitting on one of those branches anywhere... Confused
Seriously Beryl.. I have never heard of the arc before, So thank you for sharing this amazing capture. Love it, Oh and very well spotted in the first place, A real gem this one. Wink
Nemesis   [Feb 02, 2010 at 03:41 AM]
Nice image - isn't this a 270 deg parhelia? Or thats a tall tree Confused
Beryl   [Feb 02, 2010 at 05:18 AM]
Thanks Every one Very Happy If you look in my all sorts album you will see a beautiful complete Arc with a blue sky. They are very often missed because they are so high and a lot of people thik they are just eeeing part of a rainbow but up-side down . Thing is these are the same side of the sun not opposite Smile
Nemesis   [Feb 02, 2010 at 06:01 AM]
Hi Beryl - this is a parhelia (sun dog), the refractions will be horizontal within a CZ arc
Beryl   [Feb 02, 2010 at 09:23 AM]
You may be right. But. Sundogs are seen on the horizon as the sun sets this was taken at mid day and I have darkened the sky so you can see the colours . They can often be seen as left arc but you will only see one quarter of the ark. In this case there wasn't enough cloud. The tree was right in front of me as I had to use it as a sun shield
Oldboy   [Feb 02, 2010 at 11:47 AM]
Well spotted and great photo. Very Happy
Beryl   [Feb 02, 2010 at 12:16 PM]
Thanks Oldboy. Very Happy
beauxreflets   [Oct 17, 2011 at 03:07 PM]
Well spotted and captured :tup:
Beryl   [Oct 17, 2011 at 03:09 PM]
Thanks Very Happy
highlandscenics   [Apr 25, 2012 at 03:20 PM]
I knew that rainbows, when viewed from above are donut shaped, but never knew about this atmospheric phenomena. Thanks for sharing this, will definately look through your gallery for the other you mentioned. I love all things sky related, both astronomical and atmospheric..... :tup:

Comment 1 to 12 of 12
Page: 1