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.
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.....
Enjoy!
CaK and CaH 11Dec2021
- Merlin66
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CaK and CaH 11Dec2021
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Re: CaK and CaH 11Dec2021
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.
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: CaK and CaH 11Dec2021
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.
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.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: CaK and CaH 11Dec2021
These are incredible Ken and the colour is absolutely fabulous if I were clever enough or could make a miniSHG as part of a group effort I would definitely do so
Alexandra
Alexandra
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Re: CaK and CaH 11Dec2021
These are very impressive results again Ken. How much of an issue is parasitic light?
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: CaK and CaH 11Dec2021
Certainly interesting results Ken given the quiet Sun, which yours have shown the detail
Thanks vm
Terry
Thanks vm
Terry
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Re: CaK and CaH 11Dec2021
Excellent results Ken
Brian
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Maple Ridge Observatory
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Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: CaK and CaH 11Dec2021
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.
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
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer