Calcium Sun 20th July

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marktownley
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Calcium Sun 20th July

Post by marktownley »

Another hot and sunny day here in Brierley Hills, and while the temperature is quite pleasant first thing in the morning by mid afternoon was pushing 30 degrees c. Seeing is surprisingly good, certainly before the heat rises, and so just after 7am was out making the most of it. Subtle change of setup from yesterday, instead of the 2x cemax barlow I was using yesterday I used the Airylab 2.8x telecentric ahead of the CaK filter, and to my surprise found in yesterdays configuration the 2x cemax is giving me more like 3x magnification, and, importantly a lot less light than the Airylab.

Closeups were shot first and as the seeing went downhill I dropped down the aperture. First off the full disk for an overview, taken at 60mm f16.

ImageCaK-FD-60mm-f16-ICX916M by Mark Townley, on Flickr

And next a tour of the features of interest...

On the southern limb a new active region is rounding, can't make out from here whether it is a pair of spots or whether it is a spot with a light bridge, it seems pretty quiet so maybe the latter? Mid scale shots taken 60mm f28 with the ZWO290mm, Closeups 120mm f28 with the ZWO290mm... Note on the mid scale shot on the top right on the limb a large prom, also seen on the full disk, indicative of more to come in the days ahead :)

ImageNew-AR-Cak-60mm-f28-290mm by Mark Townley, on Flickr

ImageNew-AR-CaK-120mm-f28-290mm by Mark Townley, on Flickr

Switching hemispheres the spot that brought us X-class flares is back again, will be nice when it gets a bit more geoeffective!

Imagear12846-caK-60mm-f28-290mm by Mark Townley, on Flickr

Imagear12846-CaK-120mm-f28-290mm by Mark Townley, on Flickr

As usual 120mm seems to be on my limit with seeing at 393nm, and limb shots are harder to get the contrast and detail, this is despite shooting (for each closeup image) multiple 5000 frame runs, reducing these to the best 500 in PiPP, before AS3 staked the best 96 for the final images. All processing done in ImPPG.

Turning more mid disk and things improved with better contrast to play with...

Next up a patch of damp plage that hasn't really done much these past couple of days, a few very transient very small pores but that's about it...

Imageplage-CaK-60mm-f28-290mm by Mark Townley, on Flickr

This is where the big gun starts to earn it's corn when seeing allows...

ImagePlage-CaK-120mm-f28-290mm by Mark Townley, on Flickr

AR12845 has slowly being decaying away these past couple of days, with nothing but a medium size spot (pore?) and plage left now...

Imagear12845-CaK-60mm-f28-290mm by Mark Townley, on Flickr

The following shots at 120mm were taken at the very start of the imaging run...

ImageAR12845-CaK-120mm-f28-290mm by Mark Townley, on Flickr

Finally AR12842 has crackled away for the past couple of days, but had no pop...

Imagear12842-CaK-60mm-f28-290mm by Mark Townley, on Flickr

The final closeup is my favourite of the session...

ImageAR12842-CaK-120mm-f28-290mm by Mark Townley, on Flickr

I was going to shoot some Ha, but it got too hot, and I turned my attention to ordering some sun shades as below,

Imagescreen by Mark Townley, on Flickr

the idea being to rope these at strategic places to keep direct sunlight off the mount / pier area. Kind of a temporary UV resistant multi screened observatory(: :D) to try and improve local seeing? Maybe, who knows, but it will keep a bit of direct sun off me at least :D

More sun tomorrow hopefully!

Mark


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Re: Calcium Sun 20th July

Post by EGRAY_OBSERVATORY »

Hi Mark, very well done on your early morning captures which are excellent in showing the main action today.

The Sun-shield looks interesting and useful if hopefully we get enough of the clear-skies, that this will prevent Sun-burn on you and the gear...

Thanks for sharing
Terry


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Re: Calcium Sun 20th July

Post by EGRAY_OBSERVATORY »

I meant to mention that in the:-
New-AR-CaK-120mm-f28-290mm by Mark Townley, on Flickr image,
you have captured a spiked ejection from (AR2847) in the S.E.

(This new AR is not definitely numbered as yet)...

Terry


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Re: Calcium Sun 20th July

Post by DeepSolar64 »

Mark,
This is an excellent imaging post in the CaK wavelength. There's lots to see and you have covered it well. Did you notice that little jet above the spot in the third image?

That sun shade looks like a good idea!

James


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Re: Calcium Sun 20th July

Post by Ivan »

An excellent, detailed series with excellent processing. Thank you.

Ivan


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Re: Calcium Sun 20th July

Post by MAURITS »

Great Cak images Mark.


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Re: Calcium Sun 20th July

Post by John »

Really super set of images. Your last closeup is especially impressive, did you use your Bresser 127/1200 without changing the objective spacing?

John


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Re: Calcium Sun 20th July

Post by marktownley »

Thanks everyone! Yes John, as of yet the 127/1200 is 'unchanged'.


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Re: Calcium Sun 20th July

Post by eroel »

Mark:
A super CaK session, beautiful clean crisp images.
Best regards,
Eric.


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Re: Calcium Sun 20th July

Post by Valery »

Excellent results, Mark

The last image is really great. It looks like your seeing is OK at least for 150mm aperture.
If the F/D will be somewhere F/40, I believe the final resolution will be higher and bandwidth of the CaK filter will be narrower.


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Re: Calcium Sun 20th July

Post by Montana »

Wow!! what a set!! :bow :hamster: :bow today get out the HaT!!
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Re: Calcium Sun 20th July

Post by marktownley »

Thanks everyone!

More CaK today, i'm falling out of love with the HaT, it might just have to go...


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Re: Calcium Sun 20th July

Post by JochenM »

Great set of images, Mark.

120mm tends to be the practical limit for CaK 99% of the time here as well (longer wavelengths are a different story obviously).


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Re: Calcium Sun 20th July

Post by arnedanielsen »

Impressive and very inspiring CaK images, Mark!

Is the loss of light in the CeMax caused by the slightly higher magnification or does it has less transmission you think?

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Re: Calcium Sun 20th July

Post by marktownley »

JochenM wrote: Wed Jul 21, 2021 5:02 pm Great set of images, Mark.

120mm tends to be the practical limit for CaK 99% of the time here as well (longer wavelengths are a different story obviously).
Thanks Jochen, I agree!


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Re: Calcium Sun 20th July

Post by marktownley »

arnedanielsen wrote: Wed Jul 21, 2021 6:34 pm Impressive and very inspiring CaK images, Mark!

Is the loss of light in the CeMax caused by the slightly higher magnification or does it has less transmission you think?

Best regards,
Arne
Hi Arne, I think there is less transmission.


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