SHG Images - July 7

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p_zetner
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SHG Images - July 7

Post by p_zetner » Wed Jul 08, 2015 7:36 pm

Greetings Everyone.

The clouds, haze and smoke finally cleared to allow me to try out some spectroheliography.
I purchased a new camera (PGR Grasshopper, ICX694, 6Mp) which allows me to increase the magnification in my SHG.
Here are my first results (some system details are printed on the images).

Cheers.
Peter.
07Jul2015_SHG_CaK_crop.png
07Jul2015_SHG_H-Alpha_crop.png
07Jul2015_SHG_H-Beta_crop.png
07Jul2015_SHG_HeD3_crop.png

Derek Klepp
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Re: SHG Images - July 7

Post by Derek Klepp » Wed Jul 08, 2015 7:40 pm

Great results.

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Re: SHG Images - July 7

Post by Montana » Wed Jul 08, 2015 7:42 pm

Absolutely amazing pics Peter :bow :bow :bow fascinating to see all the different bands. I'm looking forward to seeing many more variety of bands for comparison :hamster: :hamster: :hamster:

Alexandra

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Re: SHG Images - July 7

Post by p_zetner » Wed Jul 08, 2015 7:48 pm

Thanks Derek and Alexandra.
Here are some comparison images with the KIS - ChroTel telescope that I wanted to post.
(You guys are too fast with your responses!)

Cheers.
Peter.
07Jul2015_SHG_CaK_KIS-compare.png
07Jul2015_SHG_H-Alpha_KIS-compare.png
07Jul2015_SHG_HeD3_KIS-compare.png

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Re: SHG Images - July 7

Post by Montana » Wed Jul 08, 2015 8:21 pm

:D I would say your CaK shot is better than the official one :hamster:

Alexandra

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Re: SHG Images - July 7

Post by highfnum » Wed Jul 08, 2015 8:59 pm

quality is unreal

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Re: SHG Images - July 7

Post by Merlin66 » Wed Jul 08, 2015 10:17 pm

Peter,
The new camera certainly seems to be working well for you.
Your results are a credit to your dedication and ability.
The SHG is coming of age..............
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: SHG Images - July 7

Post by marktownley » Thu Jul 09, 2015 5:38 am

These are stunners Peter!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: SHG Images - July 7

Post by p_zetner » Thu Jul 09, 2015 5:22 pm

Many thanks for your kind comments, everyone!

I guess I'm slowly approaching the final configuration of the SHG. I'd like to experiment with some very high spectral resolution (tandem gratings) studies yet. I suppose it would be nice to increase the image magnification for close-up shots, but focusing becomes nightmarish at large magnifications. Generally uncooperative weather makes me hesitate to try out new configurations. If it's one of the infrequent good days for imaging, I'm inclined to haul out the tried-and-true apparatus!

I experimented a little with image processing on the Ca K3 image. For example, I've been reluctant to use deconvolution on the SHG images because I was afraid it might amplify the artifacts inherent to the technique. Nothing to lose in trying, though, and I'm pretty happy with the outcome! Here's my re-processed Ca K3 image. Probably a tad over-sharpened but significantly more detail than on the original.

Cheers.
Peter.
07Jul2015_SHG_CaK_proc2_crop.png

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Re: SHG Images - July 7

Post by Montana » Thu Jul 09, 2015 7:58 pm

Wow! some superb filaments in there :bow :bow :bow :hamster:

Alexandra

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Re: SHG Images - July 7

Post by marktownley » Thu Jul 09, 2015 8:57 pm

It really is good Peter!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: SHG Images - July 7

Post by Wah » Fri Jul 10, 2015 4:05 am

Stunning results!

I just wonder why it seems the solar poles in H-beta are featureless?

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Re: SHG Images - July 7

Post by DSobserver » Fri Jul 10, 2015 4:23 pm

great HeD3 shot!!!!

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Re: SHG Images - July 7

Post by p_zetner » Sat Jul 11, 2015 5:27 pm

Thanks again, everyone!

Wah: It's comments like yours that make this forum so useful! I've gone back and noticed that my processing has been a little aggressive, so I lost detail in the vertical image direction. Here is a re-worked version with some of that detail restored. Let me know what you think.

Peter.

Re-worked H-beta.
07Jul2015_SHG_H-Beta_crop_V2.png

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Re: SHG Images - July 7

Post by Wah » Sun Jul 12, 2015 3:32 pm

Peter, I notice that most of the images have dim left and right side and bright top and bottom.
Do you know what causes it?

I've tried to reduce such effect.
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07Jul2015_SHG_H-Beta_crop_V2.png
07Jul2015_SHG_H-Beta_crop_V2.png (313.97 KiB) Viewed 1635 times

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Re: SHG Images - July 7

Post by p_zetner » Sat Jul 18, 2015 6:52 pm

Wah: There is apparently some vignetting in my device which becomes exaggerated upon processing. I try to minimize but have to decide, at some point, that I'm satisfied with the remaining field non-uniformity and leave it at that.

... and, finally, a bit more processing and a final mosaic of the four different views of the Sun on July 7.

Cheers.
Peter.
07Jul2015_SHG_4mosaic.png

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