CaK and CaH 11Dec2021

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Merlin66
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CaK and CaH 11Dec2021

Post by Merlin66 »

Still working with filters - trying to find the Holy Grail to suppress the parasitic light.
Some interesting filaments visible with a couple of proms. Both in CaK and CaH.
CaK
CaK
_083126_CaKRot_C.jpg (340.13 KiB) Viewed 603 times
CaH
CaH
083909CaH.jpg (218.73 KiB) Viewed 603 times
CaK proms
CaK proms
_083126_CaK.jpg (79.1 KiB) Viewed 603 times

I did an "inverted" CaK to better show the fluffy "flocculation clouds" visible in CaK.
I misread G E Hale's earlier description from 1929 when he said "....that a distinctive term should be adopted, and I now propose the name flocculi for the regions on the Sun's disk which are shown only on photographs made with the spectroheliography" and believed that these "clouds" were the flocculation he was talking about. He was actually referring to the brighter lines between these formations..... :oops:
CaK Inverted
CaK Inverted
_083126_CaKRot_inv.jpg (305.77 KiB) Viewed 603 times
Enjoy!


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Re: CaK and CaH 11Dec2021

Post by Carbon60 »

Great images, Ken. Are you willing to spill the beans on the filters you’re using (maybe you have done already in earlier posts)? I’m guessing they’re expensive given their tight bandpass.

Stu.


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Re: CaK and CaH 11Dec2021

Post by Merlin66 »

Stu,
The MiniSHG has a bandwidth of about 0.1A this allows the resolution of all the detail available.
The filters I’m trying are effectively acting as energy rejection filters for the CaK wavelength.
I’m waiting on a W47 filter, in the meantime I’m using a combo of a 0.9ND Baader (12.5% transmission) and an Astronomik UV-IR filter.
So, not expensive filters, The performance comes from the MiniSHG.


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Re: CaK and CaH 11Dec2021

Post by Montana »

These are incredible Ken and the colour is absolutely fabulous :bow :bow :bow if I were clever enough or could make a miniSHG as part of a group effort I would definitely do so :)

Alexandra


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Re: CaK and CaH 11Dec2021

Post by marktownley »

These are very impressive results again Ken. How much of an issue is parasitic light?


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Re: CaK and CaH 11Dec2021

Post by EGRAY_OBSERVATORY »

Certainly interesting results Ken given the quiet Sun, which yours have shown the detail

Thanks vm
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Re: CaK and CaH 11Dec2021

Post by ffellah »

Beautiful results, Ken. Those prominences stand out.

Franco


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Re: CaK and CaH 11Dec2021

Post by MapleRidge »

Excellent results Ken :bow

Brian


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Re: CaK and CaH 11Dec2021

Post by Merlin66 »

Mark,
We're not a 100% sure where it's coming from. Could be an artefact of the processing software.
The end result is a veil of light over the image which reduces clarity and definition.
In my case worse in CaK and hardly noticeable in H alpha.
Onwards and upwards.


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
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"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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