HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

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HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by christian viladrich »

Hi,

Here is a first group of images taken with the 300 mm solar Newtonian at St Véran. Conditions were average, but improved in the following days.

August, 8 - AR3394 with the OIII filter. We can see some bright spots in the filaments and some umbral bright spots :

http://astrosurf.com/viladrich/astro/so ... 0-OIII.jpg

The same spot in Gband. Intergranular bright spots are now obvious :
http://astrosurf.com/viladrich/astro/so ... -Gband.jpg

A small spot close to the limb in a region crowded with faculae. Just as a reminder, faculae are the "hot wall" of convection cells (brightened by magnetic field). With a carefull look, we can see striation on some faculae. This is one of the difference with intergranular bright spots (which have no striation).
http://astrosurf.com/viladrich/astro/so ... -Gband.jpg

Another nice small spot with some structure in the ombra :
http://astrosurf.com/viladrich/astro/so ... -Gband.jpg

August 9, with the big spot again :
http://astrosurf.com/viladrich/astro/so ... -Gband.jpg

August 10, very bad seeing condition, noteworthy a very large granule (5x the usual size) left to the sunspot :
http://astrosurf.com/viladrich/astro/so ... 96-5nm.jpg

A very nice small group :
http://astrosurf.com/viladrich/astro/so ... 96-5nm.jpg

August 11,
now we go to Ca K. The bright regions are the chromospheric counterparts of the intergranular bright points and of the faculae seen in G band at the photospheric level :
http://astrosurf.com/viladrich/astro/so ... K037nm.jpg

More to come ...


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by arnedanielsen »

Fantastic images as always Christian!

Thanks for sharing!


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by rigel123 »

You’re very bad seeing conditions must be my good ones! Gorgeous images!


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by DeepSolar64 »

Christian,
I thoroughly enjoyed these. The detail is simply stunning, made even more so that they are taken in " poor " seeing. You are great at CaK and are the KING of the photosphere!!

And that is one BIG granule! I bet it's nearly 3 arc sec across!!

Two thumbs up and two toes too!! :hamster: :bow

James


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by Dennis »

Stunning images. That big granule.. never seen one so big.


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by christian viladrich »

Thanks to all !!


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by ffellah »

Amazing images an detail, Christian.

Franco :D


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by Montana »

WOW!! :bow :bow :bow

Alexandra


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by marktownley »

Absolutely stunning thanks Christian! The CaK shot is my favourite I think...

Very much looking forward to more!


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by Carbon60 »

Absolutely superb, Christian.

We should all go to St Véran at least once, sometime :lol: The seeing there is remarkable.

Stu.


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by rsfoto »

Awesome and Stunning images


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by SteveZ »

Fantastic!


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by EdAstle »

A very nice example of what the Altair G-band can do Christian.

0 gain 0.8ms? The question mark is not me questioning your numbers. It is me questioning how I can achieve those numbers.

I had nothing close to this on my new GBand first light, last week.
C9.25, Baader OD5 film, TV PowerMate 2x.

350 gain 30-50ms (P1 M-MAX 432 is all I have). Woefully undersampled. My eyes alone tell me this, with no math at all.

I rushed through Gband 2nm, OIII 7nm, Continuum, Ha 7nm, IR 680 + 850 all in 40 minutes because that was the size of the cloud gap.

I'm nearly a factor 100 exposure away from you for the gband. I must have messed something up in my panic to acquire Mr Sunshine.

Henceforth, less "excited kid in a sweet shop" and more "wise man in a pub".
Although there is no difference there, truth be told.

Best,
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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by Montana »

Ed, you need to use ND3.8 film or lower for imaging, ND5 is for visual.

Alexandra


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by Dennis »

Montana wrote: Wed Aug 30, 2023 6:47 am Ed, you need to use ND3.8 film or lower for imaging, ND5 is for visual.

Alexandra
Yes.. but since this is not available anymore the only thing left thats not of the cost of a altair triband d-erf is probably a camera like the player one imx462 mono with very small pixels and very good sensitivity to improve signal strength.


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by christian viladrich »

Thanks guys !

Ed, as said by Allexandre, the difference between exposure times is due to the difference of transmission :
- 1/10 000 for the ND 5 Astrosolar filter,
- 5% for my uncoated primary mirror.

This is one of the big benefits of having a dedicated solar telescope.


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by H-Alpha »

Fantastic work as always Christian!!!!
:bow :bow :bow :bow :bow

I was admiring the photos again and again...

Were there from your backyard??? So many consecutive days of such seeing conditions? I am really jealous. ;-)

Your OIII photo seems to be even more crystal clear than the others. Have you been testing this filter for solar for long?
What does it offer and why you did not use it in the next sessions?

Best wishes,
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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by LeoD »

It's very revealing set, extremely clear, crispy and detailed. Fantastic processing!
regards
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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by george9 »

Christian, gorgeous images! Wow.

The following is a bit of a newbie question, since I am not much of an imager.

Given the very highest quality of your images, I have a question on processing. What kind of sharpening are you doing? Compare your first image in the original post to say a GREGOR image https://www.space.com/amazing-sun-image ... scope.html.

Your granulation looks essentially perfect. Your umbra looks essentially perfect. But your penumbra looks like it has an artifact. In the GREGOR image, the lines that make up the penumbra vary a lot in width and differ from the sizes of the dots, which also vary in size. On yours all the lines have identical width and match the diameter of the dots. I therefore wonder if the processing is forcing the detail in the penumbra to take on a fixed diameter. (Maybe wavelets can do that?)

What happens if you just adjust contrast? I wonder if a different sharpening technique would reproduce the GREGOR image almost perfectly.

George


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by christian viladrich »

H-Alpha wrote: Wed Aug 30, 2023 7:26 pm Fantastic work as always Christian!!!!
:bow :bow :bow :bow :bow

I was admiring the photos again and again...

Were there from your backyard??? So many consecutive days of such seeing conditions? I am really jealous. ;-)

Your OIII photo seems to be even more crystal clear than the others. Have you been testing this filter for solar for long?
What does it offer and why you did not use it in the next sessions?

Best wishes,
Alexandros
Thanks Alexandros !

These images are not taken from my backyard but from Pic de Chateau Renard in the French Alpes at 2930 m altitude. This is a great place for high resolution solar imaging, and the place to go for imaging with the 300 mm solar Newtonian :-)

Yes, I have been using the OIII filter for years, as well as other filters. There and pro and cons with each filter. The OIII one has a good balance between contrast and not too large sensitivity to turbulence.

The G-band or the Antlia 393-3 provide more resolution (about 1.25 factor), more contrast, and show the intergranular bright points (which are not visible with the OIII).


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by christian viladrich »

LeoD wrote: Sun Sep 03, 2023 6:55 pm It's very revealing set, extremely clear, crispy and detailed. Fantastic processing!
regards
Leo
Thanks Leo !!


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by christian viladrich »

george9 wrote: Mon Sep 04, 2023 1:42 am Christian, gorgeous images! Wow.

The following is a bit of a newbie question, since I am not much of an imager.

Given the very highest quality of your images, I have a question on processing. What kind of sharpening are you doing? Compare your first image in the original post to say a GREGOR image https://www.space.com/amazing-sun-image ... scope.html.

Your granulation looks essentially perfect. Your umbra looks essentially perfect. But your penumbra looks like it has an artifact. In the GREGOR image, the lines that make up the penumbra vary a lot in width and differ from the sizes of the dots, which also vary in size. On yours all the lines have identical width and match the diameter of the dots. I therefore wonder if the processing is forcing the detail in the penumbra to take on a fixed diameter. (Maybe wavelets can do that?)

What happens if you just adjust contrast? I wonder if a different sharpening technique would reproduce the GREGOR image almost perfectly.

George
Interesting question George !

First, the appearance of sunspots (ombra/pernombra) changes with the filter used. I don't know what was the filter used in this photo taken by the Gregor telescope.

In addition, filaments are very complex structure. This is not just black or white lines. See this beautiful movie here :
https://www.est-east.eu/index.php?optio ... -bridges-2

I also suggest this beautiful compilation of images made by the EST ("A tour of the Sun/The EST solar galery"
https://cloud.iaa.csic.es/index.php/s/nRFMPJyS5zz2wFx

So, I would say the main difference between the Gregor image and mine is the result of the huge difference of resolution, even if the Gregor photo is not presented at it full resolution. Remember the filament actual width is close to the resolution of the scope (between 0.2 to 0.6 arsec depending on the filament).

In any case, I find it very informative to check and understand how the appearance of solar features changes with resolution. This is a good way to avoid artefact.

Back to the question of processing, I probably use one of the simplest form of image processing, namely an unsharp mask (sigma =1.4 pixe, k = 8). I don't use any deconvolution since this is the best way to have artefacts (wormy structure, dot like structures, rings).

I don't use wavelet or noise reduction for the same reason (except for planetary imaging, which is a different field).

So the main answer to your question is simply the difference of resolution between the telescopes used and maybe a difference in the wavelength.


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by george9 »

Thank you, Christian! That’s exactly what I was wondering. Congrats again on an image the practically rivals a 1500mm professional scope.

George


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by marktownley »

Thanks for the insight Christian!


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by pedro »

Outstanding HR images Christian


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Re: HR images taken with the N300 mm at St Véran on August 8, 9, 10 and 11

Post by DeepSolar64 »

george9 wrote: Mon Sep 04, 2023 3:38 pm Thank you, Christian! That’s exactly what I was wondering. Congrats again on an image the practically rivals a 1500mm professional scope.

George
And that is truly outstanding. Quite amazing!! :bow


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