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Wednesday, April 04, 2007

ever seen anything like this?


It's a circumhorizontal arc, also known as a fire rainbow. This photograph was taken (no, not by me!) in northern Idaho (near the Washington border) on June 3, 2006. In general, this type of arc appears only when the sun is higher than 58 degrees above the horizon, and its light passes through high-altitude cirrus clouds made up of hexagonal plate crystals. Okay, I don't really know what that all means either (although I AM quite sure that I'm smarter than a fifth-grader, though I WON'T watch the show in case I find out I'm not, LOL), but it sure looks pretty!

And of course, after doing a bit of research to type up the above description, I come across a better explanation after finding out that this photo was originally posted at nationalgeographic.com! Ah, you must always be wary of what lands in your inbox!

The better explanation:

June 19, 2006—It looks like a rainbow that's been set on fire, but this phenomenon is as cold as ice.

Known in the weather world as a circumhorizontal arc, this rare sight was caught on film on June 3 as it hung over northern Idaho near the Washington State border (map of Idaho).

The arc isn't a rainbow in the traditional sense—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.

This particular arc spanned several hundred square miles of sky and lasted for about an hour, according to the London Daily Mail.

—Victoria Gilman

3 Comments:

Anonymous krissa said...

That's SO pretty! I love clouds anyway. They're best when it's either like the photo (blue sky with pretty white clouds) or thunderstorm clouds. When we lived in So. Cal. it was terrible - there were months upon months at a time with not one single could in the sky! ... Cool photo, thanks!

April 06, 2007 6:11 a.m.

 
Anonymous krissa said...

Um. Here's what I get for not "previewing"....that should have read "one single cloud in the sky". :)

April 06, 2007 6:12 a.m.

 
Blogger KJ's muse said...

Snort. I knew what you meant though!

And in seeing one of my earlier comments in another post I realize now that I had skipped a word despite previewing because I knew the word was supposed to be there! Funny how even your vision is influenced by what you expect to see.

Glad you like the photo!

April 06, 2007 4:27 p.m.

 

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