Greetings Everyone.
I replaced my 2400 /mm grating with a 3600 /mm. I was a little surprised to see how large the improvement in dispersion was! The downside: a trade-off in intensity. Despite being coated for UV, operation with the 3600 /mm grating required a lot more gain to work in the CaK portion of the spectrum.
A happy observation was the clear delineation between the K2 and K3 portions of the K line. Here's a sample spectrum:
Here are images made in the K1r, K2r and K3 lines:
The K3 image shows less contrasty sunspots and more apparent (if you look hard!) filaments since it images higher up in the chromosphere. If you're having trouble seeing a difference between K2 and K3, I produced a difference image (K3 minus K2r). I thought the filaments would stand out in this difference image, but that didn't happen. The active regions look quite different in the two lines, though.
Cheers.
Peter.
EDIT: The photos have gone through one revision since the initial posting. I think these are a noticeable improvement. Processing is everything!
06Jun2014 PZ's SHG Images: CaK (dispersion boost)
- p_zetner
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Re: 06Jun2014 PZ's SHG Images: CaK (dispersion boost)
Thanks, Wah!
Your images are outstanding. Maybe a higher resolution grating would increase the possibilities?
Cheers.
Peter.
Your images are outstanding. Maybe a higher resolution grating would increase the possibilities?
Cheers.
Peter.
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Re: 06Jun2014 PZ's SHG Images: CaK (dispersion boost)
Hi Peter
what a wealth of Information, thank you
what a wealth of Information, thank you
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
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from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa