Ice Crystal Halos

Odd radius diamond dust from Fairbanks

Odd radius diamond dust from Fairbanks

A one night cold snap in Fairbanks on 24 January produced the above display with halos from pyramid crystals. Let Walt Tape, who took the photo, tell more:

“The temperature was between -25 and -30 °F (-32 and -34 °C). The crystals were probably power plant products, but I am not absolutely certain of that; there was a gap in the crystal swarm that occurred between the main plume and the area of the display. I did not see the 9° or 24° arcs in the spotlight. The photo was taken on the main highway between Fairbanks and Anchorage, which was not getting heavy traffic at 5am”.

Two more photos ( 12 ).

8 comments

  • This is something we here in Finland can only dream about – pyramidal crystals in diamond dust. With these winters we are getting threr is simply no chance (at least in southern Finland). Last year Jarmo got a few displays, but those are rare exceptions. Fairbanks material is always cheerful to see.

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  • This a very beautiful photo, Walt. There hasn’t been an odd-radius post on Halo Reports for quite a while, so it is really refreshing to see such a display again!

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  • Marko was supposed to give Jari and Jukka everlasting fame and glory for resurrecting my miserable images from the dead. The images that I gave them were essentially black on black. So thanks.

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  • Nice one there walt. The plate arcs are unusually sharp looking the lower 9d plate arc shows the inverted V shape like what you see in simulations. Keep up the good work because I can only dream of halos like it being I live in Southern Ohio.

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  • I had credited Jari (who accoding to the file name in the cover photo worked on it) in the original posting, but he soon noted the credits were not needed, so I removed them.

    The other two photos were my job – practically just increasing the exposure in photoshop RAW window.

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  • Oh, don’t mention it guys. It was a joy working a file from a beautiful display like that!

    I wish we finally had some decent cold weather here. But no, what a crazy winter this has been. Instead, we got tons of snow last night.

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