What is the physics behind this circular rainbow in the sky?

AI Thread Summary
The circular rainbow in the image is primarily a result of light refraction through ice crystals. The phenomenon occurs when light interacts with water droplets or ice, creating a spectrum of colors. It is noted that all rainbows appear circular when viewed from an elevated position, such as from a plane or space shuttle. The discussion also touches on the role of water in forming the ice crystals that contribute to this optical effect. Understanding these principles highlights the fascinating interplay of light and atmospheric conditions.
D3mon
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What physics phenomena is being demonstrated in this picture?

http://teachers.dadeschools.net/jkaelin/images/extra_credit2.jpg
 
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Welcome to PF, D3mon.
The most likely one is refraction of the light, but there would also be the actions of water that caused the ice formation, freezing of the water, etc..

Or is that something other than ice?
 
Looks like a circular rainbow. What ever craft was used to take the picture (plane, space shuttle) had to be fairly high in the sky. All rainbows are circular when viewed from above.
 
I think it's easist first to watch a short vidio clip I find these videos very relaxing to watch .. I got to thinking is this being done in the most efficient way? The sand has to be suspended in the water to move it to the outlet ... The faster the water , the more turbulance and the sand stays suspended, so it seems to me the rule of thumb is the hose be aimed towards the outlet at all times .. Many times the workers hit the sand directly which will greatly reduce the water...
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