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UTA & HALO

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Author Topic: UTA & HALO  (Read 353 times)
Steveo74
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« on: April 06, 2009, 12:14:34 pm »

Hi all, Over the weekend I got a few shots of an UTA for the first time and on Sunday morning 22 degree Halo.

Anyhow here you go.

UTA








Halo






And a few of Sunrise








 Grin
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         Steven..

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rjgjr
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« Reply #1 on: April 06, 2009, 03:29:22 pm »

Very impressive images Steven. The diamond ring effect is very distinct. The jet contrail slicing through the halo really adds character to the image, and the #3 sunrise is my favorite! Thanks for sharing.
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JohnC
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« Reply #2 on: April 06, 2009, 06:27:25 pm »

Wonderful photos.
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jgs001
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« Reply #3 on: April 07, 2009, 10:09:47 am »

Very good Steven... What's a UTA ?
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John
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Steveo74
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« Reply #4 on: April 07, 2009, 10:31:22 am »

Thanks for the comments guys..

John, UTA stands for:
An upper tangent arc is a halo, an atmospheric optical phenomenon which appears over and tangent to the 22 halo around the sun.

The shape of an upper tangent arc varies with the elevation of the sun; while the sun is low (less than 2932) it appears as an arc over the sun forming a sharp angle. As the sun rises, the curved wings of the arc lower towards the 22 halo while gradually becoming longer. As the sun rises over 2932, the upper tangent arc unites with the lower tangent arc to form the circumscribed halo.

Both the upper and lower tangent arc form when hexagonal rod-shaped ice crystals in cirrus clouds have their long axis oriented horizontally, while otherwise rotated in any direction. This orientation of the crystals also produces other halos, including 22 halos and sun dogs, but a predominant horizontal orientation is required to produce a crisp upper tangent arc. Like many other halos, upper tangent arcs grade from a red inner edge to a blue outer edge because red light is refracted more strongly than blue light(Info from Wiki)
Hope this helps..
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         Steven..

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martinastro
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« Reply #5 on: April 07, 2009, 06:42:42 pm »

Stunning images Steven!. That wide angle lens really does justice to those optical phenomena. I love the halo shots...gorgeous. I seen that UTA from here also, it was one of the best I've ever seen with 'horns' on top, very bright, and it actually turned pink as the Sun set. I have never seen a pink UTA before in my life, John seen it also. We suspect the pink colour may have been a product of small concentrations of volcanic dust in the atmosphere...just a theory.  Smiley. Thanks for sharing the images.
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jgs001
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« Reply #6 on: April 07, 2009, 07:31:37 pm »

Thanks for the info Steven
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John
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Roman White
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« Reply #7 on: May 07, 2009, 07:43:41 pm »

Steven, I had somehow missed this topic.
Great images! I wish to see such bright UTA with my own eyes  Grin
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Steveo74
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« Reply #8 on: May 08, 2009, 08:46:52 am »

THanks Roman, That was the 1st time for me to see such a thing.... Hope I see more...  Grin
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         Steven..

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