The imaging window is getting really short for me now. With the Sun so low here in London, there is only a short time when there is no obstruction from trees and buildings . Unfortunately, SHG imaging is slow and when time is of the essence, choices need to be made. So today I decided to get three wavelengths in one fairly short Sunday morning session. Normally I take two or three series of scans for each wavelength to get things like the focus and exposure just right. Today, I just did one series per wavelength to try to get them all in. The H-beta turned out well; the H-alpha could have used a bit more work; and the Ca-K was a bit overexposed (some highlights were saturated). Nevertheless, it's nice to be able to compare features in all three wavelengths. Click on the images to see at higher resolution.
All images were taken the morning of 25 September. The break between the H-alpha and H-beta images is the normal time it takes to adjust the setup for a new wavelength. The time between the H-beta and Ca-K also included a pause due to clouds.
720mm APO triplet refractor. 106mm aperture for H-alpha and H-beta, 72mm for Ca-K. ASI 183MM camera. 13x sidereal rate scan for H-alpha and H-beta, 11x scan for Ca-K. 2400 l/mm holographic grating, 50mm x 50mm. 135mm f3.5 collimator and camera lenses. 9 micron wide by 12 mm long chrome on fused quartz slit. 2-inch Astronomik L1 UV/IR filter 15 cm in front of the slit. HEQ5 Pro mount with EQMod. FireCapture, AS!3, ImPPG, Photoshop Elements.
H-alpha, H-beta and Ca-K SHG images from Sept 25
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H-alpha, H-beta and Ca-K SHG images from Sept 25
Last edited by thesmiths on Tue Sep 27, 2022 11:55 pm, edited 4 times in total.
- Alun_H
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
Superb images Douglas.
Alun
Alun
Lunt 50THa solar scope
Lunt CaK B12 module
SW Evostar 72ED for full disk imaging
Sol'Ex SHG
80mm f/7 achromat used with pressure tune module off the Lunt with Lunt 100mm ERF
Bresser 90 f/10 achromat used for CaK & white light imaging & PST mod with Lunt 100mm ERF
Coronado SM40 (pre Meade) and BF10 filter set + SMII 60 richview DS etalon
Skywatcher EQ6 Pro and Ioptron CEM60
Then there is all the night kit which is far too long a list to write up here!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
Lunt CaK B12 module
SW Evostar 72ED for full disk imaging
Sol'Ex SHG
80mm f/7 achromat used with pressure tune module off the Lunt with Lunt 100mm ERF
Bresser 90 f/10 achromat used for CaK & white light imaging & PST mod with Lunt 100mm ERF
Coronado SM40 (pre Meade) and BF10 filter set + SMII 60 richview DS etalon
Skywatcher EQ6 Pro and Ioptron CEM60
Then there is all the night kit which is far too long a list to write up here!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
- Montana
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
This is such a fine trio I find the hydrogen beta very absorbing to ponder over.
Alexandra
Alexandra
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
I know what you mean. It's kind of a familiar face and yet a bit inscrutable.
- Bastelhannes
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
[/quote]
I know what you mean. It's kind of a familiar face and yet a bit inscrutable.
[/quote]
the feeling i have every morning looking into the mirror...
I know what you mean. It's kind of a familiar face and yet a bit inscrutable.
[/quote]
the feeling i have every morning looking into the mirror...
My greatest fear is being married alive.
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
As a little experiment, I took the Calcium K data and applied a pixel shift of +4 and stacked the best 6 frames. This is therefore a slightly off-band image, although still very narrow band. The results are the following:
The contrast becomes much less: the filaments essentially disappear and the prominences are much less visible. I think it is worth comparing this off-band image to a standard Lunt CaK image (taken by Pedro on the same day):
The contrast becomes much less: the filaments essentially disappear and the prominences are much less visible. I think it is worth comparing this off-band image to a standard Lunt CaK image (taken by Pedro on the same day):
Last edited by thesmiths on Tue Sep 27, 2022 8:57 am, edited 1 time in total.
- Montana
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
Wow!! absolutely fabulous so, the holy grail, how do we get our Lunt wedges to be more on the centreline (narrower)
Alexandra
Alexandra
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
Absolutely superb SHG images. You really have set the standard very, very high.
Stu.
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: H-alpha, H-beta and Ca-K SHG images from Sept 25
Fantastic results Douglas, a pleasure to see!
Double stack and tilt tuning is the closest we will get to SHG results.
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!