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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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CaK disc and ARs of January 12

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krakatoa1883
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CaK disc and ARs of January 12

Post by krakatoa1883 » Sun Jan 12, 2020 1:37 pm

Really bad seeing today with much high and low (thermal) turbulence however I couldn't resist to take some images. No spots but several filaments and two active regions were visible, the unnamed one close to the center of the disc and AR12755 at the SW limb. Through my Quark I could detect only few very minor proms, however sky is slightly hazy due to severe air pollution and faint proms may have been difficult to see. SDO images show nothing at the E limb for now.

As usual I made use of my Tecnosky 115 mm apochromat with Lunt PT or CaK modules, thanks for looking.
Attachments
2020-01-12-1030-RB-CaK-fulldisc.jpg
2020-01-12-1030-RB-CaK-fulldisc.jpg (79.25 KiB) Viewed 174 times
2020-01-12-1014-RB-Halpha-AR12755.jpg
2020-01-12-1014-RB-Halpha-AR12755.jpg (47.61 KiB) Viewed 174 times
2020-01-12-1003-RB-Halpha-Unnamed AR.jpg
2020-01-12-1003-RB-Halpha-Unnamed AR.jpg (77.18 KiB) Viewed 174 times
Raf
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Re: CaK disc and ARs of January 12

Post by ffellah » Sun Jan 12, 2020 2:34 pm

A super set of images, Raf, specially considering the conditions !

Franco :bow :bow

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Re: CaK disc and ARs of January 12

Post by marktownley » Sun Jan 12, 2020 4:29 pm

Quality images Raf!
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Re: CaK disc and ARs of January 12

Post by dhkaiser » Sun Jan 12, 2020 4:31 pm

Very nice.

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Re: CaK disc and ARs of January 12

Post by JochenM » Sun Jan 12, 2020 4:54 pm

Those still came out great, despite of the conditions. Nicely done.

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Re: CaK disc and ARs of January 12

Post by MAURITS » Sun Jan 12, 2020 9:04 pm

Very nice images Raf
Regards,
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Re: CaK disc and ARs of January 12

Post by eroel » Sun Jan 12, 2020 10:29 pm

Raf:
Beautiful shots.
best regards,
Eric.

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Re: CaK disc and ARs of January 12

Post by rsfoto » Mon Jan 13, 2020 12:29 am

Hi,

Great close up from those two spots

Rainer
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Re: CaK disc and ARs of January 12

Post by DeepSolar64 » Mon Jan 13, 2020 3:16 am

Awesome!!
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Re: CaK disc and ARs of January 12

Post by krakatoa1883 » Mon Jan 13, 2020 7:49 am

Many thanks to all of you for your kind comments!
Raf
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Re: CaK disc and ARs of January 12

Post by Montana » Mon Jan 13, 2020 10:29 am

Really lovely :bow :hamster: the close up of the AR near the limb is very 3D, superb!

Alexandra

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Re: CaK disc and ARs of January 12

Post by MalVeauX » Tue Jan 14, 2020 2:22 pm

Great captures Raf, always love seeing Cak!

Very best,

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Re: CaK disc and ARs of January 12

Post by krakatoa1883 » Tue Jan 14, 2020 3:32 pm

Thanks Alexandra and Marty, much appreciated your comments.

I love CaK too, I would say even more than H-alpha, unfortunately there is nothing to see visually at this wavelength although I have read that those who had the cataract removed are sensitive to the near UV.
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