SHG 1st light of 2016: AR12529 in H alpha

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p_zetner
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SHG 1st light of 2016: AR12529 in H alpha

Post by p_zetner » Sat Apr 16, 2016 2:52 am

Greetings Everyone.

Back in the solar imaging game as of 13Apr. No blizzards or ice storms, just clear sky with sunshine that felt almost warm.
In addition to imaging with H alpha and Ca K scopes (http://solarchat.natca.net/viewtopic.php?f=4&t=19365), I brought the spectroheliograph out for some fun.

Since the Big Spot has made for some amazing images on this forum, I thought I'd present an animation of the spot as a spectral sweep (blue to red) through the H alpha line.
123618_lvls_siz.gif
123618_lvls_siz.gif (3.81 MiB) Viewed 1747 times
Enjoy!

More images to follow.

Peter.


Edit: Oh well, the animation looped once and never again! It works if you download and run in Windows Media Player.

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by Derek Klepp » Sat Apr 16, 2016 3:49 am

Nice one Peter it worked once for me too.

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by p_zetner » Sat Apr 16, 2016 4:34 am

Thanks, Derek.

Here's a panel of 20/22 images of the animation. (Blue to red is upper left to lower right and I have yet to calibrate the step size.)

Cheers.
Peter.
Montage_123618_ARL5x5shrp_curvs_lvls.png

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by Derek Klepp » Sat Apr 16, 2016 9:36 am

Thanks

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by marktownley » Sat Apr 16, 2016 9:52 am

This is excellent Peter! I do like the sweep!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by Montana » Sat Apr 16, 2016 1:23 pm

That's pretty incredible Peter :bow :bow :hamster:

Alexandra

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by Carbon60 » Sat Apr 16, 2016 4:54 pm

Excellent work, Peter.

Stu.
Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
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NEQ6 Pro-mount
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More images at http://www.flickr.com/photos/solarcarbon60/

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by p_zetner » Sat Apr 16, 2016 5:12 pm

Many thanks Stu, Alexandra, Mark and Derek!

I'm adding a similar spectral series for the proms on the SW limb. Won't post an animation as I need to use a different computer (with Photoshop) to save the gif properly in continuous looping mode. I think that's the problem, anyway.

An interesting observation about this spectral series is that it's "lopsided". The proms are much more prevalent on the blue side of H alpha line centre, indicating that the prom plasma we are seeing has a predominant line of sight velocity approaching us. The filament has roughly the same visibility on both sides of line centre indicating that it's quiescent.

Cheers.
Peter.
Montage_123618_proms_crop2_siz_proc2.png

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by DSobserver » Sun Apr 17, 2016 8:19 am

Really nice Peter!

Is it a new SHG?

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by highfnum » Sun Apr 17, 2016 1:33 pm

clever animation

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by p_zetner » Mon Apr 18, 2016 3:22 am

Vincent;

It's my usual instrument but I've added a x2 photographic tele-extender (Komura Telemore) in combination with a 300mmfl telephoto for the camera lens to give more magnification in the image. The configuration here is then: 600mmfl camera lens, 500mmfl collimator lens and 1000mmfl telescope objective (Astro Rubinar catadioptric). This gives a system focal length of 1200mmfl but, with a 25micron slit, it also projects a slit image of 30 microns width (7px) on the camera sensor. I should really go to a smaller slit width for this configuration and plan to use 10 microns next time.

Ultimately, I would like to go to a longer focal length telescope ... the ideal way to magnify the image scale. I've tried the x2 tele-extender on the Astro-Rubinar for 2000mmf but the image was definitely too soft.

It looks like your new SHG will allow some "mix and match" of various camera lenses. I think this will give you some great flexibility to achieve a desired result.

Cheers.
Peter.

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by DSobserver » Mon Apr 18, 2016 9:04 pm

well, first trial failed....

I think that it come from using a zoom lens as a collimation : I could achieve to get a proper focus.
Middle of the sun was ok, edge a disaster...

Are you placing an ERF in front of you catadioptric?

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by Merlin66 » Tue Apr 19, 2016 5:58 am

Peter,
Glad to see the SHG active again.
Keep up the good work!
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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by p_zetner » Tue Apr 19, 2016 9:07 pm

Thanks, Ken. It's good to be back at it.

Cheers.
Peter.

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by p_zetner » Wed Apr 20, 2016 3:05 am

Vincent;

I agree that you might have trouble with a zoom lens. They are generally of lower optical quality than fixed focal length lenses. You can probably put together a good selection of fixed focal length lenses relatively cheaply by watching eBay.

Yes, I do use a uv-ir cut filter (Schneider True Cut) in front of the objective. Here's a photo:
http://www.pbase.com/p_zetner/image/151819182

Cheers.
Peter.

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Re: SHG 1st light of 2016: AR12529 in H alpha

Post by DSobserver » Fri Apr 22, 2016 11:51 am

I'll most probably use this mak (http://www.astroshop.de/fr/telescope-ma ... 80/p,46443)

Step by step, I'll build same SHG as you ;)

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