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.
Regards,
Frank
CaK in high resolution of August 3rd and 6th
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Re: CaK in high resolution of August 3rd and 6th
Nice images- I just see them in my Monitor a bit dark.
regards Rainer
regards Rainer
regards Rainer
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Re: CaK in high resolution of August 3rd and 6th
Looking good!
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Re: CaK in high resolution of August 3rd and 6th
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:
and this (right-hand side):
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:
Thanks for your comments! Regards,
Frank
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:
and this (right-hand side):
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:
Thanks for your comments! Regards,
Frank
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Re: CaK in high resolution of August 3rd and 6th
it seems plausible to me... which instrument/ filters have you used ?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.
Raf
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Re: CaK in high resolution of August 3rd and 6th
Scope was a Mewlon 210 with Lunt CaK filter, double-stacked with a yellow PST filter, Aries front ERF.
Regards,
Frank
Regards,
Frank
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Re: CaK in high resolution of August 3rd and 6th
I have a Mewlon 210 too... that's sounds interesting, it would considerably expand my imaging capabilities in this region. Thanks for info.
Raf
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