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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

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Saturday Sun 11th May '19 Sunday Sun images added

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Carbon60
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Saturday Sun 11th May '19 Sunday Sun images added

Post by Carbon60 » Sat May 11, 2019 4:33 pm

The day turned out better than expected, with a beautiful blue sky morning and some afternoon Sun with a short spell of threatening clouds between. The seeing during the morning session was sublime, registering as low as 0.5 arc seconds for brief periods on the SSM. The average was around 1, steadily getting a little worse as the morning progressed.

Active Regions 2740 and 2741 looked superb on screen through my 150mm/DS Lunt35/Basler acA1920-155um combo and 2.5x Powermate.

I tried to do them justice with a multi-pane mosaic:

Image20190511_Ha_AR2740_AR2741 by Stuart Green, on Flickr

And then a couple of individual shots:

AR2740
Image20190511_Ha_AR2740 by Stuart Green, on Flickr

AR2741
Image20190511_Ha_AR2741 by Stuart Green, on Flickr

The two regions also looked great in CaK II, with really bright plage.
Captured with my Tecnosky 125mm, same camera, with a 2.7 Barlow, Lunt B600 module, Baader K-line and Omega filter.

Image20190511_CaK_AR2740_AR2741_125_2 by Stuart Green, on Flickr

Image20190511_CaK_AR2740_AR2741_Colour_125_2 by Stuart Green, on Flickr

I even tried a WL image for a change, using a Lacerta solar wedge (Brewster angle type):

Image20190511_WL_AR2740_AR2741_Colour_125 by Stuart Green, on Flickr

A break for some chores when the clouds arrived and then back to it in the afternoon for Ha and CaK FDs.

Image20190511_Ha_FD_60 by Stuart Green, on Flickr

Image20190511_Ha_FD_Colour_60 by Stuart Green, on Flickr

Image20190511_CaK_FD_72 by Stuart Green, on Flickr

Image20190511_CaK_FD_Colour_72 by Stuart Green, on Flickr

Apologies for not getting the images in the correct orientation.... :oops:

Thanks for looking.

Stu.
Last edited by Carbon60 on Sun May 12, 2019 9:51 am, edited 1 time in total.
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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Re: Saturday Sun 11th May '19

Post by MAURITS » Sat May 11, 2019 9:06 pm

A lot of very fine images Stu.
Regards,
Maurits

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Re: Saturday Sun 11th May '19

Post by Astrophil » Sat May 11, 2019 9:21 pm

Stu, those are Great! All of them, and a little something for everyone. Job well done.

Phil

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Re: Saturday Sun 11th May '19

Post by ffellah » Sat May 11, 2019 10:16 pm

A fantastic set, Stu. Looks like you had one of those rare days with excellent conditions. The results speak for themselves.

Franco

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Re: Saturday Sun 11th May '19

Post by eroel » Sun May 12, 2019 1:48 am

Stu:
Super images.
Best regards,
Eric.

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Re: Saturday Sun 11th May '19

Post by mattwastell » Sun May 12, 2019 6:36 am

Excellent session Stu - the AR's look great in all lights - thanks for the views!
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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Carbon60 » Sun May 12, 2019 9:52 am

Many thanks, guys. Much appreciated.

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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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Carbon60 » Sun May 12, 2019 9:57 am

Just a few from this morning (Sunday 12th).

AR2741 in Ha (150mm/DS Lunt 35)
Image20190512_AR2741_Ha_150 by Stuart Green, on Flickr

AR2740- The dark core has completely disappeared.
Image20190512_AR2740_Ha_150 by Stuart Green, on Flickr

And back to AR2741, this time in CaK on the Tecnosky 125mm.

Image20190512_AR2741_CaK by Stuart Green, on Flickr

Image20190512_AR2741_CaK_Colour by Stuart Green, on Flickr

I think that's the last I'll see of these guys.

Thanks for looking.

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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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Davidm » Sun May 12, 2019 11:07 am

Fantastic images, Stu. Great detail in the CaK.
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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by David_The_Bears_Fan » Sun May 12, 2019 2:43 pm

A great haul of images there Stu. Made the most of the decent weather.
David

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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by p_zetner » Sun May 12, 2019 2:47 pm

An awesome set, Stu.
It's pretty exciting when the seeing cooperates!
Cheers.
Peter

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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Christopher » Sun May 12, 2019 3:19 pm

Awesome set Stu!
Christopher

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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by MapleRidge » Sun May 12, 2019 3:30 pm

A superb set of images Stu...excellent work :bow

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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by marktownley » Sun May 12, 2019 5:43 pm

A really productive session there Stu and excellent images to!
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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Astrophil » Sun May 12, 2019 10:23 pm

Great additions, Stu. Looking closely into the sunspot of the first Ha image from today (12th), what is that squiggly feature crossing it? It was gone by the time I looked. Very interesting to see.

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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Carbon60 » Mon May 13, 2019 5:51 am

Many thanks, everyone. The Sun certainly put on a good show over the weekend AND the weather cooperated.....

An interesting transient feature across the umbra, as you say, Phil.

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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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Montana » Mon May 13, 2019 11:40 am

WOW!! these I think are some of your best ever! if only I could get CaK like you :) you should have used the monster scope :)
:bow
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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Carbon60 » Mon May 13, 2019 6:49 pm

Montana wrote:
Mon May 13, 2019 11:40 am
WOW!! these I think are some of your best ever! if only I could get CaK like you :) you should have used the monster scope :)
:bow
Alexandra
Thanks, Alexandra. I agree with you. I worked hard to tease out as much data as I could from my SER files and to collect good data in the first place. I think everything came together just right, for a change.
I did try with the big gun on Saturday, but everything was absolutely rubbish. I spent over an hour on the following day checking and adjusting the collimation, but the views were still as bad.... I’ll check and adjust again..... not sure what else to do.

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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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Montana » Tue May 14, 2019 6:56 am

Stuart, I think there probably is. On Sunday I took several SER files which, when I watch them they are beautiful. I see lots of detail and if I extract single frames they a lovely. However, the stacks are just blurs. Therefore if I can get multiple single frames out which are publishable and the video is great to watch, then something is going wrong in the stacking. This has always been my first port of call, watch the video, does the video represent what you see in the final image? in this case, most certainly not. So I need to understand the stacking program more. Have you looked at your videos with the big scope? can you process a good single frame? how do they compare. I think we are missing something here with the large aperture processing. If I could have logged on to Flickr last night I could have shown you what I mean ;)

Alexandra

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Re: Saturday Sun 11th May '19 Sunday Sun images added

Post by Carbon60 » Tue May 14, 2019 8:31 am

Interesting, Alexandra. Maybe Valery knows a trick or two :)

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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