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ODD-RADIUS moon halo caused by ice crystals in the shape of pyramids...

 
Patagonian
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12/25/2012 09:30 PM
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ODD-RADIUS moon halo caused by ice crystals in the shape of pyramids...


The Sky Eye is watching you...


Many sky watchers have witnessed a halo around the moon--a ring of light that surrounds the lunar disk at a radius of 22 degrees. The phenomenon is caused by pencil-shaped ice crystals in cirrus clouds that bend moonlight. On Dec. 21st, Harald Edens of Magdalena, New Mexico, witnessed a rare double halo:



[link to img62.imageshack.us]


"Just after 7 PM local time I noticed a bright 22-degree halo around the moon," says Edens. "It was only when I started photographing that halo when I discovered a rare 9-degree halo inside the 22-degree halo."

The inner 9-degree halo is caused by ice crystals in the shape of pyramids. "Apart from the 9-degree circular halo, an 18-degree and perhaps a 35-degree circular halo were also present at times," he adds. All of these "odd-radius" halos are caused by icy pyramids.

The display quickly became even more varied. Edens saw at least a dozen different kinds of luminous rings and arcs, enumerated in his complete description of the event. "The display was highly transient," he notes. "Not only did the cirrus move fairly swiftly in the sky, but the halos - especially the odd-radius halos - appeared to come and go over the course of just a few minutes." But what a few minutes it was!
Patagonian (OP)

User ID: 18184495
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12/25/2012 09:30 PM
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Re: ODD-RADIUS moon halo caused by ice crystals in the shape of pyramids...
[link to spaceweather.com]
Anonymous Coward
User ID: 2704006
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12/25/2012 09:33 PM
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Re: ODD-RADIUS moon halo caused by ice crystals in the shape of pyramids...
Everything seems to be considered a rare event on space weather anymore

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