AR12814 in CaK - 11th April

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AR12814 in CaK - 11th April

Post by marktownley »

Woke up this morning to more snow - seems 'April showers' this year are the snowy variety. Fortunately the blob of precipitation that sat upon us at the start of the day started to shift by about 10am and I decided to image in Cak, shooting the full disk at 60mm f16 it was apparent that in between the towering cumulus clouds that were scudding by that the seeing wasn't too bad, certainly better than I thought.

ImageCaK-FD-bw by Mark Townley, on Flickr

ImageCaK-FD-colour by Mark Townley, on Flickr

What was apparent was that what is likely to be designated AR12814 was active and bright in CaK, so, going for 100mm and f40 with the IMX74 camera I decided to go for a closeup of this emerging active region. Going for 8ms exposure and runs of 6000 frames, meant it took about a minute to capture each avi. I figured just as the cloud cleared the sun I would start shooting and would keep shooting till I either ran out of HDD space or another cloud came... Well it was another cloud and I managed to shoot 10 seperate avi files. The one below was the best:

ImageAR12814-CaK-bw by Mark Townley, on Flickr

ImageAR12814-CaK-colour by Mark Townley, on Flickr

The seeing started to roll off quickly on the fifth file, however i thought it might be interesting to do an animation of the first 4, all of which had similar quality values. Surprisingly how quick things change in 4 minutes!

Imagecak-ani-1 by Mark Townley, on Flickr

Pleased with how these came out, could have probably ran at 120mm to be honest, but my focus today is on a couple of hours time when I have an ISS transit... Wonder if the clouds will oblige? We will have to see!

Hope you like.

Mark


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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

I certainly hope an ISS capture comes your way Mark.

You have exceptionally-well captured CaK images and the close-up of the AR in the SE is excellent, as well as the animation effort - good under the weather conditions too...

Well done
Terry


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Re: AR12814 in CaK - 11th April

Post by marktownley »

Thanks Terry! If the clouds oblige it should be a good one...
ISS-details.jpg
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Re: AR12814 in CaK - 11th April

Post by krakatoa1883 »

Fantastic CaK, Mark, the spicule layer and the proms are really impressive, do you process them separately from the disc ?


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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

Thanks for the ISS update/data.

Here too-cloudy to hopefully even see it if it passes into our view, but hopefully will some a capture from yourself Mark.

Terry


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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

★★

Thursday 2021-04-22 08:01:13.42 • Solar transit shows my next one Mark and not the one you are going to see today...

ISS angular size: 26.28″; distance: 1051.58 km
Angular separation: 3.8′; azimuth: 95.0°; altitude: 19.7°
Center line distance: 1.75 km; visibility path width: 14.58 km
Transit duration: 1.94 s; transit chord length: 30.9′


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Re: AR12814 in CaK - 11th April

Post by marktownley »

Fingers crossed for you Terry, just sat waiting patiently here for it. Fluffy cumulus floating around here at the moment so it's not a given yet...


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Re: AR12814 in CaK - 11th April

Post by marktownley »

krakatoa1883 wrote: Sun Apr 11, 2021 1:18 pm Fantastic CaK, Mark, the spicule layer and the proms are really impressive, do you process them separately from the disc ?
No Raf, shot and processed in one. Thanks for the kind comments.


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Re: AR12814 in CaK - 11th April

Post by dhkaiser »

I also have a ISS transit today, and it is raining. Hope you have better luck!


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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

Yes Mark, I'm watching your clouds pass over-head as well as mine in the S.E., but at least you have a tad-less than here.

Terry


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Re: AR12814 in CaK - 11th April

Post by Jordan Konisky »

Nice, Mark. Just wondering, for CaK imaging are there advantages in capturing in avi versus ser? And always setting the gain at zero?

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Re: AR12814 in CaK - 11th April

Post by Stardust5858 »

Lovely captures Mark, well done. I managed some too. Lovely sunny day here.


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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

I assume that time shown as 16:38 Mark - is UTC/GMT/Z ??? Should be shown which time-zone is being used after the time. (probably does somewhere)...

Why can't all time just be one, without having to continually change the clocks twice a year - everywhere ??

At least as I'm only abut 1/2 a degree East of the Greenwich Meridian, I would not have to keep climbing steps and ladders to change my clocks, albeit most of my clocks are radio-controlled...

Aviation has to use GMT wherever they are in the world - officially... I like that...

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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

On time, as local/BST I see it on StarryNight as also passing (over Venus-here)...

Just awaiting Mark's captures

Terry


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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

Only those under the relatively fine-line of the ISS eclipsing the Sun for just a couple of seconds (or less)...

Terry


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Re: AR12814 in CaK - 11th April

Post by marktownley »

Thanks folks! No good for the ISS transit i'm afraid - the clouds came 5 mins before and went 10 mins after... Hey ho!


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Re: AR12814 in CaK - 11th April

Post by Carbon60 »

Beautiful images, Mark. Really excellent resolution. Boiling froth!!

Sorry to hear the ISS transit capture was unsuccessful (this time).

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Re: AR12814 in CaK - 11th April

Post by EGRAY_OBSERVATORY »

Oh well Mark, you tried and no doubt another opportunity will occur.

I will be trying to capture it after dusk on my Oculus All-Sky camera, as soon as I check the passes...

Cheers
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Re: AR12814 in CaK - 11th April

Post by Martin_S »

Hi Mark , shame about the ISS, my turn for a question. Are you binning the 174 at high focal ratio's?

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Re: AR12814 in CaK - 11th April

Post by torsinadoc »

fantastic calcium animation and images


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Re: AR12814 in CaK - 11th April

Post by Merlin66 »

Great CaK images, the resolution is excellent.
I'd need to relocate to the Ranges to get such results!
Well done.


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Re: AR12814 in CaK - 11th April

Post by DeepSolar64 »

Mark,
Those CaK are excellent. I can see the limb spicule layer and prominences! The closeup of the active region is great too. I can see two tiny pores in there and three of what appears to be tiny filaments going between and bridging the two pores..

Well done!!

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Re: AR12814 in CaK - 11th April

Post by MAURITS »

Great Cak images Mark.


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Re: AR12814 in CaK - 11th April

Post by marktownley »

Jordan Konisky wrote: Sun Apr 11, 2021 2:24 pm Nice, Mark. Just wondering, for CaK imaging are there advantages in capturing in avi versus ser? And always setting the gain at zero?

Jordan
Thanks Jordan. I always capture avi. Quite the opposite with gain, I use as much gain as I can get away with to keep the brightness up and the exposure as short as possible.


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Re: AR12814 in CaK - 11th April

Post by marktownley »

Martin_S wrote: Sun Apr 11, 2021 7:25 pm Hi Mark , shame about the ISS, my turn for a question. Are you binning the 174 at high focal ratio's?

Martin
Hi Martin, No, not binning the 174, would give the equivalent of nearly 12um pixels which would be hugely undersampling, but great for working at f80.

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Re: AR12814 in CaK - 11th April

Post by marktownley »

Thanks everyone for your kind comments!


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Re: AR12814 in CaK - 11th April

Post by oreoluna »

Hello Mark.
Very interesting animation. Here we see the movement of the granules and the escape of calcium gas.
Excellent!
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Re: AR12814 in CaK - 11th April

Post by Jordan Konisky »

Thanks, Mark
So what range of exposure and FPS do you aim for in CaK imaging? Same for surface and proms?

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Re: AR12814 in CaK - 11th April

Post by marktownley »

Jordan Konisky wrote: Mon Apr 12, 2021 1:43 pm Thanks, Mark
So what range of exposure and FPS do you aim for in CaK imaging? Same for surface and proms?

Jordan
Hi Jordan.

At the closeup scale is 8ms and gain up about a third on the slider.

Full disk i'm shooting at 3ms and barely any gain.

Same for surface and proms.

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