Circumhorizontal arc - Newcastle NSW Australia

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Comments (6)

Mick Loxley on November 2, 2008

Circumhorizontal Arc, quite rare apparently.

It is caused by light passing through wispy, high-altitude cirrus clouds. The sight occurs only when the sun is very high in the sky (more than 58° above the horizon). What's more, the hexagonal ice crystals that make up cirrus clouds must be shaped like thick plates with their faces parallel to the ground.

When light enters through a vertical side face of such an ice crystal and leaves from the bottom face, it refracts, or bends, in the same way that light passes through a prism. If a cirrus's crystals are aligned just right, the whole cloud lights up in a spectrum of colors.

Amelia Royan on December 8, 2008

Lovely shot with rainbows in the air. You get my vote Mick. Good explanation too. Hope you get a lot more visits.

Greetings from NorwaY, Amelia

Nayt1980 on December 8, 2008

At first I thought that it's a wave, but now I see this are clouds! great shot!

Leandro Durães on December 10, 2008

good shot! congratulations!

~adrzym~ on December 22, 2008

Voted! :)

Greetings Adam

~my november contest~

Giuliano Mangani on December 26, 2008

Beautiful scene and colors !


Regards,and best wishes from Italy



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Photo details

  • Uploaded on November 1, 2008
  • © All Rights Reserved
    by Mick Loxley
    • Camera: Canon EOS 40D
    • Taken on 2008/10/26 13:57:43
    • Exposure: 0.000s (1/3000)
    • Focal Length: 44.00mm
    • F/Stop: f/4.500
    • ISO Speed: ISO200
    • Exposure Bias: 0.00 EV
    • No flash