CaK in high resolution of August 3rd and 6th

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LTHB
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CaK in high resolution of August 3rd and 6th

Post by LTHB » Tue Aug 14, 2018 9:20 pm

Two more CaK images from August 3rd and August 6th, and two more attempts at image processing that takes the DOT pictures as a standard.

Image

Image

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Frank

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Re: CaK in high resolution of August 3rd and 6th

Post by rsfoto » Wed Aug 15, 2018 12:33 am

Nice images- I just see them in my Monitor a bit dark.

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Re: CaK in high resolution of August 3rd and 6th

Post by Montana » Wed Aug 15, 2018 9:02 am

Delightful images and processing :bow

Alexandra

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Re: CaK in high resolution of August 3rd and 6th

Post by marktownley » Wed Aug 15, 2018 4:03 pm

Looking good!
Image
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Re: CaK in high resolution of August 3rd and 6th

Post by LTHB » Wed Aug 15, 2018 8:02 pm

Thanks, Alexandra and Mark!

Rainer, you are right, the images are quite dark, certainly a lot darker than most CaK images posted here on solarchat or on CN, and I am not sure if I find them aesthetically very pleasing. However, my intention in processing them was to get a "look" similar to the CaK images of the Dutch Open Telescope, in order to compare them and to try to understand which/how much of the surface structures in the images depict real structures on the sun and which/how much are processing artefacts. (Tinkering a little with the settings for deconvolution and/or other sharpening tools it is not difficult to generate very different looking surface structures, at least that was my experience with high resolution CaK images, so I wanted some kind of standard from the professional imagers for what is real and what is not. I explained this in a little more detail in another thread, i.e. here: viewtopic.php?f=4&t=24905)

Two of the DOT images I have in mind are this:

Image

and this (right-hand side):

Image

To study my own images side by side with them the darkness helps, I think. One question that this seems to answer for me is, how the thin "worm-like" structures in my images come about: At first they looked susiciously like sharpening artefacts to me, in particular in the darker areas (some kind of blown-up, sharpened noise), not like the kind of structures I had expected to see on a big plasma ball, so to speak. Looking at the DOT images, however, seems to me to suggest that the worm-like structures are blurred versions (blurred because of the smaller apertures of our amateur scopes, plus seeing maybe) of the finer, much more delicate corresponding structures in the DOT pictures - and these look much more plausible as plasma structures to me.

A lighter version of my first image would look like this:

Image

Thanks for your comments! Regards,

Frank

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Re: CaK in high resolution of August 3rd and 6th

Post by krakatoa1883 » Thu Aug 16, 2018 12:04 pm

LTHB wrote:
Wed Aug 15, 2018 8:02 pm
Looking at the DOT images, however, seems to me to suggest that the worm-like structures are blurred versions (blurred because of the smaller apertures of our amateur scopes, plus seeing maybe) of the finer, much more delicate corresponding structures in the DOT pictures - and these look much more plausible as plasma structures to me.
it seems plausible to me... which instrument/ filters have you used ?
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Re: CaK in high resolution of August 3rd and 6th

Post by LTHB » Thu Aug 16, 2018 6:24 pm

Scope was a Mewlon 210 with Lunt CaK filter, double-stacked with a yellow PST filter, Aries front ERF.

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Frank

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Re: CaK in high resolution of August 3rd and 6th

Post by Valtori » Fri Aug 17, 2018 6:28 pm

Hi Frank,

Very pleasant HR CaK images!!

Val

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Re: CaK in high resolution of August 3rd and 6th

Post by krakatoa1883 » Sat Aug 18, 2018 4:29 pm

LTHB wrote:
Thu Aug 16, 2018 6:24 pm
Scope was a Mewlon 210 with Lunt CaK filter, double-stacked with a yellow PST filter, Aries front ERF.
I have a Mewlon 210 too... that's sounds interesting, it would considerably expand my imaging capabilities in this region. Thanks for info.
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