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Tuesday, June 27, 2006

Not two but three halos!

The last two days have been great for atmospheric optical phenomena. Today's bright halo ws actually three. Just as I mentioned yesterday, most people only noticed the bright 22 degree halo, but as the previous image shows, a rare 9 degree halo was visible for those who knew enough to look for it. This image shows the 22 degree halo along with a the much fainter, but also rare 46 degree halo. 46 degree halos only appear about 2% of the time you can see the 22 degree halo. They are formed by the same hexagonal ice crystals that form the 22s but the light exits them at a different angle. Canon 20D - 1/1000th, 20mm @ f/10, ISO 100

3 Comments:

Blogger Jim said...

Nice collection of halo photos! I looked more closely at my other halo shots and didn't see the 9 degree halo at all. The 22 degree halo was probably about as bright as I've ever seen it today.

11:39 PM  
Blogger Richard said...

I guess there was only a small amount of the pyramidal crystals. These two shots were taken at the peak of brightness for me, so possibly all of the effects were related.

12:42 AM  
Blogger Les Cowley said...

The upper halo is a circumscribed halo produced by column crystals with their axes horizontal.

http://www.sundog.clara.co.uk/halo/circum.htm

The lower halo is a circumhorizon arc

http://www.sundog.clara.co.uk/halo/cha.htm

8:13 AM  

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