Saturday Sun 20th May 2023

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Carbon60
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Saturday Sun 20th May 2023

Post by Carbon60 »

A beautiful day and an opportunity to take some images of the newest active regions and FDs at various wavelengths. Again, the seeing conditions were poor for the most part, so many images suffered from the effects of a wobbly sky and didn’t make the cut. The large flare at AR13311 was particularly impressive and a joy to watch.

Image20230520_CaK_FD_Mono by Stuart Green, on Flickr

Image20230520_CaK_FD_Colour by Stuart Green, on Flickr

Image20230520_Ha_FD_Mono by Stuart Green, on Flickr

Image20230520_Ha_FD_Colour by Stuart Green, on Flickr

Image20230520_Ha_AR13310_Mono by Stuart Green, on Flickr

Image20230520_Ha_AR13310_colour by Stuart Green, on Flickr

Image20230520_Ha_AR13311_13313_Mono by Stuart Green, on Flickr

Image20230520_Ha_AR13311_13313_colour by Stuart Green, on Flickr

Image20230520_Ha_Prom1 by Stuart Green, on Flickr

Image20230520_Ha_Prom2 by Stuart Green, on Flickr

Image20230520_Ha_Prom3 by Stuart Green, on Flickr

Image20230520_WL_AR13310 by Stuart Green, on Flickr

Image20230520_WL_AR13311_13313 by Stuart Green, on Flickr

Image20230520_WL_AR13302_13305_13308 by Stuart Green, on Flickr

Thanks for looking.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Saturday Sun 20th May 2023

Post by Martin_S »

Nice work Stu, the WL is exceptional considering your viewing conditions.


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Re: Saturday Sun 20th May 2023

Post by pupak »

Excellent collection of photos. The FD images in particular are beautifully detailed.
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Re: Saturday Sun 20th May 2023

Post by Rob63 »

Great set Stu, some fantastic detail in those images.
My phone was giving me multiple flare alerts yesterday but typically it was complete cloud cover outside


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Re: Saturday Sun 20th May 2023

Post by arnedanielsen »

Wonderful collection Stu! Looks like you had a wonderful time under the Sun!

Best regards,
Arne


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Re: Saturday Sun 20th May 2023

Post by rigel123 »

Great disks and amazing closeups Stu!


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Re: Saturday Sun 20th May 2023

Post by eroel »

Stu:
Super images all of them.
Thanks for sharing them.
Eric.


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Re: Saturday Sun 20th May 2023

Post by Montana »

I'm so glad you were able to get out and enjoy the sunshine and get some fabulous images. The flare looks quite spectacular!

I had a solar session Sunday afternoon when I got home and despite the seeing being jumpy it was surprisingly good, I bet the morning would have been terrific, but at least I could test the G-band filter :)

:bow :hamster:
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Re: Saturday Sun 20th May 2023

Post by ffellah »

A superb set, Stu: it is great to see the sun so active. You captured all features in great detail, a wonderful session.

Franco :bow


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Re: Saturday Sun 20th May 2023

Post by Carbon60 »

Many thanks, everyone. It was a good session, but I just wish for better seeing. I sound like a broken record on this topic, but it seems to be such a common feature of my imaging sessions. I need a solar imaging vacation somewhere with excellent seeing to itch that scratch.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
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Re: Saturday Sun 20th May 2023

Post by marktownley »

You got a lovely set of images here Stu!


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Re: Saturday Sun 20th May 2023

Post by Carbon60 »

Thanks, Mark.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Saturday Sun 20th May 2023

Post by nicspenceryork »

Incredible set of images.
They’re all brilliant but your WL caught my eye, what did you use to get the WL close ups? I’d hoped for great things with the big spot but, like you, it was 1- Nil to the jet stream! Strangely I caught more when I switched to CaK, maybe there was just a lucky gap.
Nic


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Re: Saturday Sun 20th May 2023

Post by Carbon60 »

nicspenceryork wrote: Tue May 23, 2023 6:47 am Incredible set of images.
They’re all brilliant but your WL caught my eye, what did you use to get the WL close ups? I’d hoped for great things with the big spot but, like you, it was 1- Nil to the jet stream! Strangely I caught more when I switched to CaK, maybe there was just a lucky gap.
Nic
Hi Nic,

Many thanks.

My calcium closer views were a bust, so the opposite to you. :lol:
My WL images were taken using a Lacerta wedge with the safety OD filter stripped out and replaced with a 430 nm (10nm bandwidth). I also have a UV/IR filter on the input side to take the sting out. Needless to say, it’s only used for imaging. With a 2.7 x Barlow on my Basler acA2440-75 um camera I’m getting ridiculously fast exposure speeds (below 100 micro seconds, typically 50 us) which helps freeze out the turbulent atmosphere. The scope is a Tecnosky 125 mm refractor f7.8 which I stop down to 80 mm in bad seeing.

Hope this helps. :)

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Saturday Sun 20th May 2023

Post by nicspenceryork »

Thanks for the description.
Having been bothered by ‘snow’ in my images with too high a gain in the past I now, after reading your description, wonder whether I’ve gone too far the other way and my exposure is probably too high in WL. Drum roll (bit embarrassed to say ha ha) I hadn’t quite taken in that fast exposure helps freeze out turbulent sky. Something in my head is arguing more detail is caught with a longer exposure (like a pinhole camera) I think I’ve got a bit mixed up. I had been working to a rough rule of gain being ok as long as it’s not more than half way up the scale but I seem to have forgotten that lately and gone with too much exposure. Maybe longer is exposure is best when the sky isn’t turbulent? 🤔
Nic


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Re: Saturday Sun 20th May 2023

Post by Peterm »

These are just sensational images Stu, absolutely wonderful to look at. BravO!


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