Some Natural Spectroscopy!

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p_zetner
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Some Natural Spectroscopy!

Post by p_zetner »

The weather here has been quite frigid lately with high temperatures near -20C. Low temperatures and low Sun definitely curtail imaging and observing but, on the plus side, we are occasionally treated to beautiful displays of atmospheric phenomena involving atmospheric ice crystals. Today, we could witness a day-long spectacle of complex arcs associated with refraction (and consequent dispersion) through these ice crystals. Here are two photos of the beauty on display.
IMG_2685_proc.png
IMG_2685_proc.png (672.7 KiB) Viewed 4669 times
IMG_2687_proc.png
IMG_2687_proc.png (594.67 KiB) Viewed 4669 times

It's actually quite hard to appreciate the extent over the sky of the various arcs and halos from photographs alone. The inner circular halo has an angular radius of 22 degrees while the outer "halo" (actually a big arc - the supralateral arc) has a 46 degree radius. That's a lot of sky coverage and is very impressive to witness by eye! I was limited to a 24mmf camera lens for these pics and the cold killed my battery before I could start setting up a panorama.

Here are the names of some of the observed features:
IMG_2687_proc_lbls.png
IMG_2687_proc_lbls.png (185.57 KiB) Viewed 4670 times
There is a reasonably good description of these at http://www.atoptics.co.uk/ under the topic "Ice Halos".

All of the observed features can be explained by the phenomenon of "minimum deviation" of a light ray propagating through a prism (hexagonal prism in the case of these ice crystals). Arranging the minimum deviation condition can be a useful technique in prism spectroscopy.

Cheers.
Peter.


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Re: Some Natural Spectroscopy!

Post by marktownley »

Fantastic! I'm always looking up for atmospheric optics, fascinating to see.


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Re: Some Natural Spectroscopy!

Post by Montana »

Wow! these are absolutely superb, I bet in really life they were amazing. I have never seen anything other than classic sundogs.

:hamster: :bow
Alexandra


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Re: Some Natural Spectroscopy!

Post by rsfoto »

Hi,

Absolutely stunning. Once in a lifetime event ...


regards Rainer

Observatorio Real de 14
San Luis Potosi Mexico

North 22° West 101°
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Re: Some Natural Spectroscopy!

Post by highfnum »

a real nice catch


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Re: Some Natural Spectroscopy!

Post by Carbon60 »

Beautifully captured, Peter. What a treat.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
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Re: Some Natural Spectroscopy!

Post by Wah »

I can see the Ha line!
Just kidding :P


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Re: Some Natural Spectroscopy!

Post by p_zetner »

Thanks everyone.

I wish I’d had the foresight to charge my camera battery fully and put together a mosaic. It was quite the spectacle.

Cheers.
Peter.


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Re: Some Natural Spectroscopy!

Post by christian viladrich »

Hello Peter,
This is beautifull. Thanks for sharing. I have never had such a spectacle here.


Christian Viladrich
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Editor of "Solar Astronomy"
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Re: Some Natural Spectroscopy!

Post by highfnum »

:D 3 dog sun
Does this mean another
War of the roses?


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