17May - CAK Images with a 6CR from Singapore

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yltansg
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17May - CAK Images with a 6CR from Singapore

Post by yltansg »

Setup for CAK Imaging - A 6CR with re-spaced objective lens optimised for CAK imaging. It is fitted with a 0.6 Angstrom Calcium Solar filter system comprising 2 Alluxa 0.14nm Ca K filters tilted in a 3D-Skybender. Camera - IMX290 Mars-M USB3.0 Mono Camera. Imaging Scale - 0.14 arcsec/pixel

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The seeing was fair.
A survey of granulations:
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AR3679:
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Do a right-click to view the images in their full resolution.

Enjoy and do give me your feedback.

Alfred
Last edited by yltansg on Fri May 17, 2024 1:12 pm, edited 2 times in total.


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Re: 17May - CAK Images using a 6CR

Post by rigel123 »

Great closeups!


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Re: 17May - CAK Images with a 6CR from Singapore

Post by vineyard »

V v nice closeup of the AR. What is that circular feature at c 2 o'clock on the second biggest AR region - it has a bright ring around it which the other smaller dark regions don't?


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Re: 17May - CAK Images with a 6CR from Singapore

Post by yltansg »

vineyard wrote: Fri May 17, 2024 1:27 pm V v nice closeup of the AR. What is that circular feature at c 2 o'clock on the second biggest AR region - it has a bright ring around it which the other smaller dark regions don't?
That image was taken at UTC 00:24, I am not sure which circular feature you are referring to.

Here is another image of it taken at UTC 00:44. Hopefully he you can see if there is any change between the 2. Can you point to the feature you referring to?

Image


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Re: 17May - CAK Images with a 6CR from Singapore

Post by Dennis »

Good results Alfred.


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Re: 17May - CAK Images with a 6CR from Singapore

Post by pupak »

Superb!
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Re: 17May - CAK Images with a 6CR from Singapore

Post by vineyard »

yltansg wrote: Fri May 17, 2024 1:55 pm Can you point to the feature you referring to?
Hi Alfred, I've marked the feature in a white circle in the attached image. It seems different to the other smaller areas as it has a brighter edge than the others so I wasn't sure if it was a different type of thing (don't know enough about the details of solar mechanics). Cheers, Vin
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826_9-USMi L13-093-210 O0224lk2.jpg
826_9-USMi L13-093-210 O0224lk2.jpg (931.09 KiB) Viewed 838 times


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Re: 17May - CAK Images with a 6CR from Singapore

Post by KMH »

Very nice!

Kevin


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Re: 17May - CAK Images with a 6CR from Singapore

Post by yltansg »

vineyard wrote: Fri May 17, 2024 4:34 pm
yltansg wrote: Fri May 17, 2024 1:55 pm Can you point to the feature you referring to?
Hi Alfred, I've marked the feature in a white circle in the attached image. It seems different to the other smaller areas as it has a brighter edge than the others so I wasn't sure if it was a different type of thing (don't know enough about the details of solar mechanics). Cheers, Vin
Hi Vin. Thank you for marking the black dot. I went through all 5 recordings of the same active region. The first thing I did was to rule out that it is a dust speck. This was easy to do because my mount is not 100% polar aligned and solar features drift (including that dot) during each 20 sec recording (about 2000 frames).

So my conclusion is that the dot is a separate dark area that is part of that active region.

The next thing I did was to change my post-processing. I have attached another image taken at UTC 0:43. On this image, the circle around the black dot is slightly not so pronounced. That may be due to a slightly different amount of stretching that I did.

Image

What do you and the rest think?

Alfred


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Re: 17May - CAK Images with a 6CR from Singapore

Post by Dennis »

Much better processing on the last one Alfred. Still there is a lot of detail hidden.


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Re: 17May - CAK Images with a 6CR from Singapore

Post by yltansg »

Dennis wrote: Sat May 18, 2024 7:15 am Much better processing on the last one Alfred. Still there is a lot of detail hidden.
Thanks for your feedback, Dennis. Here is another rendition of the same image:
Image

Do you think it is over sharpened?

Alfred


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Re: 17May - CAK Images with a 6CR from Singapore

Post by ffellah »

I think they look great, Alfred, well done !

Franco


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Re: 17May - CAK Images with a 6CR from Singapore

Post by marktownley »

Very nice Alfred! Your getting lots of nice detail, I prefer the processing of the later images.

Try tweaking the tilt of the primary filter (one closest the objective) - can you see how the right hand of the image is softer and showing chromospheric detail whereas the left hand side is harder and no chromosphere. You're aiming for that softness across the entire fov.


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Re: 17May - CAK Images with a 6CR from Singapore

Post by yltansg »

marktownley wrote: Sat May 18, 2024 11:23 am Very nice Alfred! Your getting lots of nice detail, I prefer the processing of the later images.

Try tweaking the tilt of the primary filter (one closest the objective) - can you see how the right hand of the image is softer and showing chromospheric detail whereas the left hand side is harder and no chromosphere. You're aiming for that softness across the entire fov.
Hi Mark,

If you have not mentioned it, I wouldn't even know that there is a difference in softness and chromospheric details. Thank you for pointing that out. I need to learn how to look for this during the acquisition. :bow

Alfred


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Re: 17May - CAK Images with a 6CR from Singapore

Post by DeepSolar64 »

Nice!

Imagers like You, Christian and Mark show that those Alluxa CaK filters are tops!

James


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Re: 17May - CAK Images with a 6CR from Singapore

Post by vineyard »

Hi Alfred, yes the later images are definitely an improvement. The softer side of the image actually gives it a very nice "alive" feel - good stuff!


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