Found the next challenge! CN wavelength

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Merlin66
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Found the next challenge! CN wavelength

Post by Merlin66 »

While researching on magnetometers (June 1972 issue of Sky&Telescope) I found the "Babinet compensator" they used cost thousands $$$$$$.
Andre Rondi has achieved creditable results with basic 1/4 wave plates on his SHG, which I'm sure cost MUCH less!!
http://www.astrosurf.com/rondi/obs/shg/ ... nglais.htm

What caught my eye was a SHG solar image taken in the light of the molecular Cyanogen.
This records in the photosphere/ chromosphere interface and to quote "A significant observational advance occurred when Sheeley discovered that a spectroheliogram taken in the head band of cyanogen (3883.4 A) mapped the (magnetic) fields just as well as a Zeeman picture. Only the polarity information was missing....(these) pictures could be made more rapidly than the Zeeman films, better resolution was achieved."

I haven't been able to find any other solar CN images...this one was taken 50 years ago (July 4, 1970) That's my next challenge!!!
CN_3883A_June1972 S&T.jpg
CN_3883A_June1972 S&T.jpg (391.58 KiB) Viewed 121 times


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Re: Found the next challenge! CN wavelength

Post by marktownley »

Looking forward to seeing the results Ken ;)


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Re: Found the next challenge! CN wavelength

Post by Carbon60 »

Always nice to have a challenge :)

It will be interesting to follow your progress.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Found the next challenge! CN wavelength

Post by Merlin66 »

Managed to get a better image in Mg(b2) which allowed comparison with a Ca II K image and my latest challenge the CN molecular line "head" at 3883A.
It looks like the Mg is very close to white light (photosphere) then the CN and finally the CaK in the lower chromosphere.

Note the filaments in CaK (and the proms)
MiniSHG on the ED80. (Some artefacts to be fixed on the CN line - not an easy target.)
Mg (b2)
Mg (b2)
103703_Mg.jpg (153.79 KiB) Viewed 67 times
Close up AR 2929
Close up AR 2929
103703_crop02Mg.jpg (361.65 KiB) Viewed 67 times
CN (3883) molecular band
CN (3883) molecular band
114545_02_CN.jpg (52.92 KiB) Viewed 67 times
Ca II K
Ca II K
112503_CaK.jpg (202.93 KiB) Viewed 67 times
Ca II K proms
Ca II K proms
112503_CaK_protus.jpg (166.79 KiB) Viewed 67 times


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"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: Found the next challenge! CN wavelength

Post by KMH »

That's really interesting. I have to admit it never occurred to me that molecular species would be present at the photo/chromo interface. But a quick google shows the CN heat of formation is about 101 kcal/mole, which (says google) equates to about 50000 K temperature. Great images!

Kevin


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Re: Found the next challenge! CN wavelength

Post by marktownley »

Interesting Ken and very nicely captured. CN looks similar to CaH and Mg,


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Re: Found the next challenge! CN wavelength

Post by Merlin66 »

The professionals say the CN reflects the active magnetic regions and hence different from the other wavelengths.


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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