MiniSHG and filaments

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Merlin66
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MiniSHG and filaments

Post by Merlin66 »

Recognising the various threads and the great contributions being made, I've put together a summary document which shows examples of CaK filaments from SHG and commercial CaK filters.
Scanning my solar book collection; Zirin, Noyes, Loughhead, Phillips and Abetti only gave a few examples of CaK filaments - all from Spectroheliographs.
Phillips - Fig6.6 p115 "...but the filaments are barely visible"
Abetti -Plate 52 (Meudon, 1930), Plate 54 (Meudon, 1949), Plates 65-68 (Meudon 1929) Impressive sequence of images.
Mini_SHG and CaK Filaments.pdf
(1 MiB) Downloaded 57 times
My conclusions:

1. A CaK filter/system with a bandwidth <0.4A is necessary to give high contrast images of filaments in CaK
2. Filaments are easier to image on CWL and just below (into the blue wing <0.2A)
3. Filaments, if recorded with bandwidths >1A usually appear washed out and ghostly.


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jacinto
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Re: MiniSHG and filaments

Post by jacinto »

Muy buena informacion !!!, thanks

Jacinto


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Montana
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Re: MiniSHG and filaments

Post by Montana »

That's a great summary Ken, you should pop it into the library in a few days :)

Alexandra


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Re: MiniSHG and filaments

Post by marktownley »

Great summary Ken.


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Re: MiniSHG and filaments

Post by pedro »

Great doc Ken, thanks for sharing


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