Saturday Sun Aug 24th

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Carbon60
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Saturday Sun Aug 24th

Post by Carbon60 » Sat Aug 24, 2019 3:25 pm

A blue sky day, but stubborn cirrocumulus clouds right over the Sun this morning frustrated any attempts at long-term imaging (animations), but I was determined to at least get some images the lovely proms that I could see on GONG and occasional gaps gave me some short periods of cloud-free viewing. First off, though, was a quick experiment with a blue 430 nm filter fitted to my Lacerta WL wedge. Removing the neutral density filter gave me a bright image (as you'd expect), which I was hoping for and which I could control using a polarising filter fitted to the nose of my 5x Powermate. The objective was to achieve as fast an exposure time as possible to freeze out the atmospheric turbulence without frying my IMX174 sensor!! Rotating the Powemate/polariser gave a brighter and dimmer image within the range I was interested in, taking the exposure time down to 122us on a 2.5x Powermate and 1ms on the x5. I could probably fine tune this a bit further to optimise. I also had a Baader IR/UV filter screwed into the nose of the Lacerta.

Here's the resulting image after processing:

Image20190824_430nm_x5_Lacerta by Stuart Green, on Flickr

I then reverted back to a 540 nm Green continuum, again without the neutral density filter, and this time I used a polariser double stack to attenuate the image brightness (it was too bright and out of range without crossing the polarisers). The exposure time was now down to 400us on a x5 Powermate.

Image20190824_540nm_x5_Lacerta by Stuart Green, on Flickr

With the sky conditions being somewhat variable it was difficult to undertake a proper side-by-side comparison, but I've tried to pull out the best level of detail using each method, so the processing is slightly different in either case. The reasoning behind all of this was really just to work out how to use the wedge with different filter configurations.

Anyhow, back to the proms....

Here's the one that Mark T imaged as a superb animation with the plasma knots.

Image20190824_Ha_Prom1 by Stuart Green, on Flickr

and the one diametrically opposite....

Image20190824_Ha_Prom2 by Stuart Green, on Flickr

Finishing off the Ha session with a general view of a patch of chromosphere.

Image20190824_Ha by Stuart Green, on Flickr

and back to the 430 nm for a full disk view.

Image20190824_WL_FD_430nm by Stuart Green, on Flickr

It took me 2.5 hrs to get this little collection together. I spent most of my time twiddling my thumbs, waiting for the gaps :roll: :roll: :roll:

Thanks for looking.

Stu.


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Re: Saturday Sun Aug 24th

Post by MalVeauX » Sat Aug 24, 2019 4:57 pm

Lovely captures Stu!

Very best,



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Re: Saturday Sun Aug 24th

Post by Montana » Sat Aug 24, 2019 5:36 pm

Oh dear, sounds like your weather was bad up north :( we have had clear blue skies all day :) some super images though and worth the patience, the prom looks fantastic :bow :bow I hope it sticks around till tomorrow :hamster:

Alexandra



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Re: Saturday Sun Aug 24th

Post by Starry Jack » Sat Aug 24, 2019 5:42 pm

I'm getting tires of my jaw dropping open. If I don't compliment someone's work forgive me. Everyone is doing amazing work and I can't wait until solar max if it is this good now.


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Re: Saturday Sun Aug 24th

Post by MAURITS » Sat Aug 24, 2019 6:20 pm

A lot of very nice captures Stu.


Regards,
Maurits

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Re: Saturday Sun Aug 24th

Post by Carbon60 » Sun Aug 25, 2019 6:45 am

Many thanks everyone. :)

Stu.


Lunt LS60THa B1200 PTFT
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Re: Saturday Sun Aug 24th

Post by marktownley » Sun Aug 25, 2019 7:01 am

A really nice set there Stu! The increase at resolution at 430nm is quite noticeable. The other images came out well too. Hope you get a bit more sun today, looks like it will clear up for you.


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Re: Saturday Sun Aug 24th

Post by MapleRidge » Sun Aug 25, 2019 11:59 am

Superb images across all the filters Stuart...well done :bow

Brian


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Re: Saturday Sun Aug 24th

Post by ffellah » Sun Aug 25, 2019 12:21 pm

Great work there, Stu. The granulation shots came out really well, and the prominences are beautiful. Definitely 2.5 hours well spent.

Franco



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Re: Saturday Sun Aug 24th

Post by p_zetner » Sun Aug 25, 2019 12:55 pm

Very nice views, Stu.
Superb work on the granulation images.
Cheers.
Peter



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Re: Saturday Sun Aug 24th

Post by eroel » Sun Aug 25, 2019 10:27 pm

Stu:
A nice Saturday session, mine was hazy and cloudy.
Best regards,
Eric.



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Re: Saturday Sun Aug 24th

Post by allhoest » Mon Aug 26, 2019 7:29 am

"I also had a Baader IR/UV filter screwed into the nose of the Lacerta."
These polarized filters don't cut the IR, so using a UV/IR is a good idea.

"exposure time down to 122us on a 2.5x Powermate and 1ms on the x5".
Probably the powermate x5 has a factor of x6.5 or f7.

Great shots.

CS
Alex



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Re: Saturday Sun Aug 24th

Post by yltansg » Mon Aug 26, 2019 8:59 am

Hi Stu,

Thanks for the great spread of nice images!!

Alfred



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Re: Saturday Sun Aug 24th

Post by Carbon60 » Wed Aug 28, 2019 6:56 pm

Many thanks, everyone.

Stu.


Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/

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