Sun in K and CaH Sept. 5th & 6th

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Sun in K and CaH Sept. 5th & 6th

Post by krakatoa1883 » Thu Sep 06, 2018 5:50 pm

Few images of yesterday and today of the Sun at short wavelengths, there are no major features to image therefore I am using my imaging time for experiments.
2018-09-06-0830-RB-K line-granulation.jpg
2018-09-06-0830-RB-K line-granulation.jpg (171.62 KiB) Viewed 454 times
2018-09-06-0737-RB-CaH.jpg
2018-09-06-0737-RB-CaH.jpg (142.39 KiB) Viewed 454 times
2018-09-05-0900-RB-CaH-fulldisc.jpg
2018-09-05-0900-RB-CaH-fulldisc.jpg (430.22 KiB) Viewed 454 times
As suggested elsewhere I removed from my Baader K filter one of the two glasses and I have to admit that images are better defined in this way. Also I replaced the defective BF of my Quark with the same K filter and an Astronomik UV/IR cut (but I left the blue glass in place and removed only the clear glass). The system works fine and this mod solved some problems of unevenness in my images.

I can't do any better than the above with my current setup, so I definitively need a more narroband device(s) and a better corrected scope than my short achromat. For the latter I could use my Mewlon 210 with a front ERF, as suggested by Valery, but I have to consider if the mean seeing at my observing site would allow to make use of such a large aperture.
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Re: Sun in K and CaH Sept. 5th & 6th

Post by Carbon60 » Thu Sep 06, 2018 6:57 pm

Very nice images, Raf. Lovely granulation and hi-res CaH.

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Re: Sun in K and CaH Sept. 5th & 6th

Post by ffellah » Thu Sep 06, 2018 6:59 pm

Great images, Raf ! Congratulations on the granulations :D

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Re: Sun in K and CaH Sept. 5th & 6th

Post by krakatoa1883 » Fri Sep 07, 2018 8:58 am

Thanks Franco and Stu, this spotless Sun is really boring, I think I'll stop imaging granulation and calcium features for some time now :lol:
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Re: Sun in K and CaH Sept. 5th & 6th

Post by Montana » Fri Sep 07, 2018 9:11 am

Wow! these are lovely pics :bow

Can I ask what exactly you did to your Baader K line? I find I cannot use mine as it is optically blurred and I wondered if this was a potential way to fix it?

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Re: Sun in K and CaH Sept. 5th & 6th

Post by Valery » Fri Sep 07, 2018 1:19 pm

krakatoa1883 wrote:
Fri Sep 07, 2018 8:58 am
Thanks Franco and Stu, this spotless Sun is really boring, I think I'll stop imaging granulation and calcium features for some time now :lol:
This is true for for images taken with small telescopes and respectively at small scales. With 8" and up telescopes images at 393nm (contimuum) and especially Ca K/H are full of interesting details. Short living filigrees and pores (also short living) at 393nm and great dramatism at CaK and CaH.

If to stay with 100m telescope, then yes, these years of sun minimum are boring. The easiest way is to stop, yes.

Here is the image taken with C9,25" telescope when testing a new 240mm DERF filter. This is one of many similar areas on the sun every day.

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2018 Aust 29 05h50m  C9,25 PST CaK  etalon.png
2018 Aust 29 05h50m C9,25 PST CaK etalon.png (926.39 KiB) Viewed 426 times
Last edited by Valery on Fri Sep 07, 2018 2:39 pm, edited 1 time in total.
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Re: Sun in K and CaH Sept. 5th & 6th

Post by krakatoa1883 » Fri Sep 07, 2018 1:47 pm

Yes, Valery, I know the limitations of a 100 mm aperture and that there are lot of details to be imaged with larger apertures. However before to purchase a front ERF for my Mewlon I am trying to better evaluate the average seeing at my location in order to be sure that is worth the expense, should I conclude positively on this I'll make this step in the very near future ;)

Alexandra, as you know Baader K line is actually composed by two glasses, the upper one tilted to the other by means of a plastic spacer which is thicker on one side. As I now use it mainly as a part of my Quark BF I removed one of the glasses and I noted that sharpness increased through it. Moreover in this way the front thread of the filter barrel remains free for further stacking.
k filter.jpg
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Re: Sun in K and CaH Sept. 5th & 6th

Post by TheSkyBurner » Fri Sep 07, 2018 5:56 pm

krakatoa1883 wrote:
Fri Sep 07, 2018 8:58 am
Thanks Franco and Stu, this spotless Sun is really boring, I think I'll stop imaging granulation and calcium features for some time now :lol:
The boringness you have been afflicted with is from still images. You have hit the wall of enjoyment that stillness provides, and it no longer will matter what resolution you use. Even with a 14" telescope at 14 meters you will not enjoy imaging stillness.

Start making animations and you will be quite pleased again, i promise!

Even with the high resolution Valery is using, the images are boring without the ellerman bombs and flocculi in motion.

Animations are the way to go during solar minimum, and your CaH filter will provide lots of ellerman bombs and movement.

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Re: Sun in K and CaH Sept. 5th & 6th

Post by marktownley » Sat Sep 08, 2018 12:10 pm

Lovely images throughout the thread. Interesting as to your mods Raf.
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Re: Sun in K and CaH Sept. 5th & 6th

Post by robert » Sat Sep 08, 2018 2:09 pm

Great results and I think your seeing must be good to get granulation like that with 130mm aperture. No boring at all!
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Re: Sun in K and CaH Sept. 5th & 6th

Post by krakatoa1883 » Sun Sep 09, 2018 10:15 am

Thanks Alexandra, Mark, Robert.

@Robert: at my location seeing is good for imaging granulation in K line until about 2 hours from sunrise then quickly deteriorates and only H alpha or continuum imaging is possible. In summer the sky is also slightly hazy and this makes images noisy if the Sun is not enough high.
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Re: Sun in K and CaH Sept. 5th & 6th

Post by Valery » Sun Sep 09, 2018 11:14 am

krakatoa1883 wrote:
Sun Sep 09, 2018 10:15 am
Thanks Alexandra, Mark, Robert.

@Robert: at my location seeing is good for imaging granulation in K line until about 2 hours from sunrise then quickly deteriorates and only H alpha or continuum imaging is possible. In summer the sky is also slightly hazy and this makes images noisy if the Sun is not enough high.
The same is here.


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Re: Sun in K and CaH Sept. 5th & 6th

Post by eroel » Sun Sep 09, 2018 3:18 pm

Raf:
Super images and nice modifications in your setup.
At home my biggest aperture scope is the 102mm f/9 Meade and the 102mm f/7 Stellarvue, as also the Solarmax 90-DS., so I am getting to the same point you are now, though at the rural observatory I have a 6" f/12 refractor and catadiopric scopes up to 12", so I better start imaging the Sun with bigger scopes.
Best regards,
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Re: Sun in K and CaH Sept. 5th & 6th

Post by krakatoa1883 » Sun Sep 09, 2018 4:22 pm

Thanks Eric. In a rural location you should be able to enjoy a better seeing than mine as I live in a large city and only rarely I move my scopes. My larger instrument is a 210 mm Takahashi Mewlon.
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Re: Sun in K and CaH Sept. 5th & 6th

Post by Valery » Sun Sep 09, 2018 6:46 pm

krakatoa1883 wrote:
Sun Sep 09, 2018 4:22 pm
Thanks Eric. In a rural location you should be able to enjoy a better seeing than mine as I live in a large city and only rarely I move my scopes. My larger instrument is a 210 mm Takahashi Mewlon.
I live in a 400.000 city and my scope is at about 1.3m above ground level. I can meet good enough seeing several times in a months (warm season) and only between 1,5 - 2 hours from the sunrise for CaK and up to 2.5 hours for H-a.

BTW 210mm in CaK is a very powerfull instrument - like C14 in H-a !!!
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