Unexpected sunny morning 1 February 2023
- Averton
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Unexpected sunny morning 1 February 2023
It was forecast to return to cloudy conditions today but when we looked out the window this morning it was unexpectedly clear. We quickly set up to take some images but the forecast was correct, just a little late. By the time we had taken a few images the sky quickly changed from no clouds to full clouds. An hour later and it was raining as well ... ah summer in Melbourne
Anyway it was good to get another glimpse of what was going on and the seeing was a little better which was nice. We only got a full disk in Ha and 393nm.
Ha full disk 393nm disk seeing data
Anyway it was good to get another glimpse of what was going on and the seeing was a little better which was nice. We only got a full disk in Ha and 393nm.
Ha full disk 393nm disk seeing data
Clare & Peter
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Re: Unexpected sunny morning 1 February 2023
great FD images there Clare & Peter
Pedro Re'
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Re: Unexpected sunny morning 1 February 2023
Awesome work on all Clare & Peter!
I always find it challenging to edit CaK and many Ha images to increase contrast and detail. The disc is often unevenly lit making the center much brighter than the edges. Some of this is natural due to seeing deeper into the Sun's layers at the center than at the edge ( limb darkening ) but some is often caused by the filter(s) too. This uneven brightness makes simply increasing the contrast impossible. I used several tools in GIMP to try to increase the visibility of the faculae/plage visible in your CaK image. Brightness-contrast, curves, saturation, shadows-highlights and in the last image a slight amount of gaussian blur. I wish there was a quick " even brightness " tool!!
It is really hard to get the plages to show up like I want to. I guess that's the beauty of ultra-narrowband filters like the Lunt modules. Higher contrast!!
Here are the two re-edited images of yours.
James
I always find it challenging to edit CaK and many Ha images to increase contrast and detail. The disc is often unevenly lit making the center much brighter than the edges. Some of this is natural due to seeing deeper into the Sun's layers at the center than at the edge ( limb darkening ) but some is often caused by the filter(s) too. This uneven brightness makes simply increasing the contrast impossible. I used several tools in GIMP to try to increase the visibility of the faculae/plage visible in your CaK image. Brightness-contrast, curves, saturation, shadows-highlights and in the last image a slight amount of gaussian blur. I wish there was a quick " even brightness " tool!!
It is really hard to get the plages to show up like I want to. I guess that's the beauty of ultra-narrowband filters like the Lunt modules. Higher contrast!!
Here are the two re-edited images of yours.
James
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Re: Unexpected sunny morning 1 February 2023
Really nice imaging Clare & Peter. The only chance I have in the next few days is tomorrow morning 646am our time for an IIS Solar transit (my first attempt) last 1.7 seconds. It's not at an ideal distance/size @ 1100km and 24" but will have a go and who knows..
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Re: Unexpected sunny morning 1 February 2023
Thanks Clare and Peter for your images - are you able to tell what is the best time of day to image the Sun using your SSM data?
Regards, John W.
Regards, John W.
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Re: Unexpected sunny morning 1 February 2023
A terrific set the spots are all very tiny at the moment, but in one week maybe the big spots will return for a second pass.
Good luck with the ISS Peter!
Alexandra
Good luck with the ISS Peter!
Alexandra
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Re: Unexpected sunny morning 1 February 2023
Nicely done, Clare and Peter. It never ceases to amaze me how quickly sometimes the sky can go from clear and blue from horizon to horizon to cloudy, usually just when things get set up ready for imaging. I’m convinced solar scopes are cloud magnets.
Stu.
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Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Unexpected sunny morning 1 February 2023
Thanks Maurits, Arne and Pedro
Your comments are greatly appreciated.
Your comments are greatly appreciated.
Clare & Peter
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Re: Unexpected sunny morning 1 February 2023
Thanks James.DeepSolar64 wrote: ↑Wed Feb 01, 2023 4:10 pm Awesome work on all Clare & Peter!
I always find it challenging to edit CaK and many Ha images to increase contrast and detail. The disc is often unevenly lit making the center much brighter than the edges. Some of this is natural due to seeing deeper into the Sun's layers at the center than at the edge ( limb darkening ) but some is often caused by the filter(s) too. This uneven brightness makes simply increasing the contrast impossible. I used several tools in GIMP to try to increase the visibility of the faculae/plage visible in your CaK image. Brightness-contrast, curves, saturation, shadows-highlights and in the last image a slight amount of gaussian blur. I wish there was a quick " even brightness " tool!!
It is really hard to get the plages to show up like I want to. I guess that's the beauty of ultra-narrowband filters like the Lunt modules. Higher contrast!!
Here are the two re-edited images of yours.
James
2023-02-01 full disk 393nm_3nmFilter__Averton.jpg
2023-02-01 full disk 393nm_3nmFilter_2_Averton.jpg
Thanks for attempting to improve the contrast of that image. We were not entirely satisfied with it and are still playing with different methods of improving the contrast. We also use GIMP and have played round with all of the tools you have mentioned but haven't found a satisfactory combination that is repeatable and so have just gone with a straight image colourised for the time being. It is definitely still a work in progress.
Your second image looks good.
Clare & Peter
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Re: Unexpected sunny morning 1 February 2023
Thanks PeterPeterm wrote: ↑Wed Feb 01, 2023 10:36 pm Really nice imaging Clare & Peter. The only chance I have in the next few days is tomorrow morning 646am our time for an IIS Solar transit (my first attempt) last 1.7 seconds. It's not at an ideal distance/size @ 1100km and 24" but will have a go and who knows..
Good luck with the transit. Hope you get an image. It is something that we have wanted to try.
Clare & Peter
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Re: Unexpected sunny morning 1 February 2023
Hi John,
Yes there is no doubt that the SSM data can and does provide enough information to choose the best time to image.
Thus far it has confirmed what we had already suspected and is in line with all the information about on solar imaging. That is, first thing in the morning until around 10am is a good 1-1.5 arc seconds better than 10am to 2pm. Thereafter it is probably 2 arc seconds worse. Much later on there does seem to be some minor improvement but we cannot get low enough for the improvement to be significant (the roof of the house gets in the way).
We also suspect that later in the year as the rise position of the sun moves further north there will also be further improvement as the sun path will clear some localised heat sources. It'll be good to be able to quantify this. It is still early days as we need to collect a good deal more data and correlate it to other collected data, BOM, Meteoblue, Skippy etc.
Clare & Peter
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Re: Unexpected sunny morning 1 February 2023
Thanks Alexandra
It will be interesting to see if AR3190 does make it back around. It looks like your crown prom from a week back has returned.
Clare & Peter
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Re: Unexpected sunny morning 1 February 2023
Thanks Stu
It is amazing just how quickly weather conditions can change! Fortunately for us, it's usually not dangerous to us like the case of sailors or mountaineers. Solar scopes are definitely cloud magnets but in our case, any scope seems to do the job
Clare & Peter
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Re: Unexpected sunny morning 1 February 2023
A fine set, Clare and Peter. Happy that you had a chance to image the sun before it quickly turned cloudy.
Franco
Franco
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Re: Unexpected sunny morning 1 February 2023
Great set!
Warren
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Re: Unexpected sunny morning 1 February 2023
Super disks!
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