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Old 14-04-2019, 02:52 PM
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Merlin66 (Ken)
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AR2738 -Ha and Cak plus prom

Some images from this morning, average seeing...
Managed to get a few CaK to compliment the Ha.
A few small proms visible....
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Old 14-04-2019, 03:02 PM
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AstroJunk (Jonathan)
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Nice. I've managed some visual glimpses of this fantastic spot through a rather annoying multi layered cloudy Brisbane sky!
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Old 14-04-2019, 04:12 PM
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GUS.K (Ivan)
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Nice images Ken,thanks for sharing. Had a few short visual sessions as well today due to clouds.
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Old 14-04-2019, 04:43 PM
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Merlin66 (Ken)
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Thanks guys, appreciated.
We've still got a few days left before it goes round the edge......
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Old 14-04-2019, 04:50 PM
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Nice Ken good to see some differing views of it
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Old 14-04-2019, 04:57 PM
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Nice one Merlin

I got literally 20 minutes this afternoon and noticed the bright spec in the centre of the sun spot; not notice that before. When I was looking at my initial images, I thought I had processed too hard but the bright speck in the middle of the spot is real. Any ideas?
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Old 14-04-2019, 05:06 PM
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Sounds like your imaging the light bridge which is currently crossing the umbra. Visible in white light, Ha and CaK.
This is usually a precursor to the spot splitting.....let's see what happens.

Mark,
Thanks. The DIY CaK filter seems to be working well. Really needs a f15 - f20 beam to give a good bandwidth....
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Old 15-04-2019, 06:54 AM
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I’m curious. Other than the CAK filter I assume you also need solar film for the image. Any other energy rejection filters?
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Old 15-04-2019, 09:22 AM
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No up front ERF. But the "Cak" filter is actual an stacked assembly of four filters.
The front 2" Baader Blue CCD acts as an ERF, then a 390nm UV cut filter, a 80nm wide band CaK filter followed by the 2A narrowband CaK filter...
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Old 16-04-2019, 07:58 AM
N1 (Mirko)
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Nice one Ken, I'm impressed with that CaK stack you are using
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Old 16-04-2019, 09:26 AM
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Mirko,
Thanks.
In the absence of a Lunt or Coronado CaK filter, the DIY does seems to do a creditable job, at about a 1/4 of the cost!!
Onwards and Upwards
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Old 16-04-2019, 10:20 AM
Saturnine (Jeff)
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Enjoyed your images Ken, and everybody elses, hope to get another chance at AR2738 before it rotates out of view. Time and clouds aren't always in tune with my ambitions. Am getting a little curious about CaK filters now as well, not sure that is a wise thing.
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Old 16-04-2019, 11:46 AM
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Jeff,
CaK is a completely different view of the Sun...
The flocculation, plage and sunspots, fibrils are are seen at a different height from Ha. Slightly lower than in the core of the Ha.
The resolution (theoretical) is much higher than Ha (636/380 = x1.7) but the seeing is equally worse!

Unfortunately Coronado no longer produce their CaK filters...only Lunt left in the game unless you DIY.....
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Old 16-04-2019, 07:44 PM
John W (John Wilkinson)
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AR2738 -Ha and Cak plus prom

Nice pics Ken - this was an interesting sunspot esp. as there is not much activity at the moment. Re; your CaK stack - can you see the resultant wavelength visually? I know its in the UV region. Regards, John W.
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Old 16-04-2019, 08:41 PM
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John,
The CaK is purely for imaging. I don’t know of many “mature” observers would be able to see down in the UV......
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Old 17-04-2019, 06:55 AM
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I had the opportunity to have a look through a CaK scope just out of curiosity and was quite surprised with what I was able to see. I hadn't seen the video image beforehand and it matched up well. I'm 58 (with my own corneas).

Any SHG images Ken ?

Steve.
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Old 17-04-2019, 08:51 AM
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Merlin66 (Ken)
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Steve,
You did well!
I'll have to stick to CaK imaging....

The SHG.. good question. I now have three variants:
1. The ST80 (f5) with a Classical spectrograph.
2. The TS102 (f11) with the Spectra-L200.
3. The Carton 100mm (f15) spectroheliograph.

#1 and #2 have been a bit disappointing - problems traced to focal ratios and undersized collimators/ gratings.
The SHG looks very promising but a bit heavy for the available HEQ5 mount.
Needs "perfect" conditions and no wind....
The ASI 183MM I bought for the SHG turned out to be "not suitable for solar narrowband" and ZWO replaced it with the ASI 1600MM - still to be seriously tested. In the meantime I have the ASI 174 but this shows some terrible banding in the spectral image.....no answers as yet.

So, no images at the moment...

Weather permitting, the SHG is ready to use. Let's hope it can be used on AR 2738.
Onwards and Upwards.
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Last edited by Merlin66; 17-04-2019 at 09:27 AM.
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Old 17-04-2019, 10:30 AM
N1 (Mirko)
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Hi Ken, that's a carton alright. Admirable dedication and once the camera is sorted this should give great results. Is this able to be turned into a SH-scope as well, the type that can synthesise full disk? Poor lil Vixen rail though

Hoping to get some more more sun myself too.
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Old 17-04-2019, 11:34 AM
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Mirko,
Well spotted! The Vixen rail has already been replaced by the wider Losmandy rail....

No, this is an imaging SHG. To turn it into a visual SHS would require modifying the layout and adding Anderson prisms and a second exit slit.
Another project on the never ending list....
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