Sun in three lights- 13th November 2020
- Carbon60
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Sun in three lights- 13th November 2020
A quick session with the smaller scopes this morning under less than ideal conditions.
Hydrogen alpha- DS Lunt 60, Basler acA1920-155um
'White Light' at 430nm instead of my usual 540nm which gives a little more faculae contrast. Filter installed on the output side of a Lacerta solar wedge. Altair Astro Lightwave 72mm/F6, Basler acA2440-75um
Same scope for the Ca II K image using a Lunt B1800 Ca K straight through module plus Baader K-Line and Omega filter.
Nice to see the Sun with multiple spots over a broad region. Cycle 25 is pepping up
Montage of all three together:
20201113_Sun_3-Lights_Montage by Stuart Green, on Flickr
... and the individual images....
20201113_CaK_FD_Mono by Stuart Green, on Flickr
20201113_CaK_FD_colour by Stuart Green, on Flickr
20201113_WL_430_FD_mono by Stuart Green, on Flickr
20201113_WL_430_FD_colour by Stuart Green, on Flickr
20201113_Ha_FD_mono by Stuart Green, on Flickr
20201113_Ha_FD_colour by Stuart Green, on Flickr
Thanks for looking.
Stu.
Hydrogen alpha- DS Lunt 60, Basler acA1920-155um
'White Light' at 430nm instead of my usual 540nm which gives a little more faculae contrast. Filter installed on the output side of a Lacerta solar wedge. Altair Astro Lightwave 72mm/F6, Basler acA2440-75um
Same scope for the Ca II K image using a Lunt B1800 Ca K straight through module plus Baader K-Line and Omega filter.
Nice to see the Sun with multiple spots over a broad region. Cycle 25 is pepping up
Montage of all three together:
20201113_Sun_3-Lights_Montage by Stuart Green, on Flickr
... and the individual images....
20201113_CaK_FD_Mono by Stuart Green, on Flickr
20201113_CaK_FD_colour by Stuart Green, on Flickr
20201113_WL_430_FD_mono by Stuart Green, on Flickr
20201113_WL_430_FD_colour by Stuart Green, on Flickr
20201113_Ha_FD_mono by Stuart Green, on Flickr
20201113_Ha_FD_colour by Stuart Green, on Flickr
Thanks for looking.
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: Sun in three lights- 13th November 2020
Hi Stu,
Excellent images. 430 nm is more to the UV / Purple side so why that brown colour ? :-)
What filter did you use ?
Excellent images. 430 nm is more to the UV / Purple side so why that brown colour ? :-)
What filter did you use ?
regards Rainer
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Observatorio Real de 14
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Re: Sun in three lights- 13th November 2020
Stunning work Stuart. With images like these showing the sun superbly in three wavelengths the images speak for themselves. No descriptions needed.
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Re: Sun in three lights- 13th November 2020
I was thinking 540nm green continuum filter.
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Re: Sun in three lights- 13th November 2020
Guys,
It is quite normal to colour our images more based on art than science. Hydrogen alpha is a deep, rich, red, but rarely is it represented this way in our Ha images. We tend to use an orange colour instead. Likewise images captured in continuum green at 540nm tend to be represented in cream/yellow as they are intended to display the solar disk as it is perceived to appear in a broad spectrum white light image, and cream/yellow is in keeping with expectations, generally. Similarly with 430nm. These (and other coloured filters, such as red) can assist with enhancing the contrast of certain features, such as faculae and granulation, but otherwise they capture the essence of a WL disk.
Of course, we can colour our images any colour we like, as they are all false colours applied in processing anyhow . It’s always a matter of personal preference, but often follows certain unwritten norms.
My ‘brown’ is intended to be a beige/cream. Maybe I should colour this one yellow?
BTW it’s 430nm with a FWHM of +/- 10nm, so not particularly narrow. I obtained mine from ThorLabs at 25mm diameter and fitted it in a standard 1.25 inch filter housing using epoxy adhesive at the perimeter.
Cheers
Stu.
It is quite normal to colour our images more based on art than science. Hydrogen alpha is a deep, rich, red, but rarely is it represented this way in our Ha images. We tend to use an orange colour instead. Likewise images captured in continuum green at 540nm tend to be represented in cream/yellow as they are intended to display the solar disk as it is perceived to appear in a broad spectrum white light image, and cream/yellow is in keeping with expectations, generally. Similarly with 430nm. These (and other coloured filters, such as red) can assist with enhancing the contrast of certain features, such as faculae and granulation, but otherwise they capture the essence of a WL disk.
Of course, we can colour our images any colour we like, as they are all false colours applied in processing anyhow . It’s always a matter of personal preference, but often follows certain unwritten norms.
My ‘brown’ is intended to be a beige/cream. Maybe I should colour this one yellow?
BTW it’s 430nm with a FWHM of +/- 10nm, so not particularly narrow. I obtained mine from ThorLabs at 25mm diameter and fitted it in a standard 1.25 inch filter housing using epoxy adhesive at the perimeter.
Cheers
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: Sun in three lights- 13th November 2020
Very true Stuart. When I first viewed the Sun through an Ha telescope I was actually expecting an orange color as seen in images. It seems few people use " Ha Red " as the color of choice for ha images. I think it's a contrast issue. Orange shows contrast better and the eye is more sensitive to orange than red. But it again may be all about aesthetics.
James
James
Lunt 8x32 SUNoculars
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Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
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Re: Sun in three lights- 13th November 2020
Hi Stu,Carbon60 wrote: ↑Fri Nov 13, 2020 6:36 pm Guys,
It is quite normal to colour our images more based on art than science. Hydrogen alpha is a deep, rich, red, but rarely is it represented this way in our Ha images. We tend to use an orange colour instead. Likewise images captured in continuum green at 540nm tend to be represented in cream/yellow as they are intended to display the solar disk as it is perceived to appear in a broad spectrum white light image, and cream/yellow is in keeping with expectations, generally. Similarly with 430nm. These (and other coloured filters, such as red) can assist with enhancing the contrast of certain features, such as faculae and granulation, but otherwise they capture the essence of a WL disk.
Of course, we can colour our images any colour we like, as they are all false colours applied in processing anyhow . It’s always a matter of personal preference, but often follows certain unwritten norms.
My ‘brown’ is intended to be a beige/cream. Maybe I should colour this one yellow?
BTW it’s 430nm with a FWHM of +/- 10nm, so not particularly narrow. I obtained mine from ThorLabs at 25mm diameter and fitted it in a standard 1.25 inch filter housing using epoxy adhesive at the perimeter.
Cheers
Stu.
Sorry for my question, pure curiosity ...
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
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Re: Sun in three lights- 13th November 2020
No problem, Rainer. Better to be curious and ask...
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
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More images at http://www.flickr.com/photos/solarcarbon60/
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More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Sun in three lights- 13th November 2020
Hi Stu,
In order to understand where is 430 nm I just looked at one of my Sun sprectrums. It is the Fe 430.774 nm or 4307.74 Å line
I made that spectrum with my LISA Spectrograph on Takahashi TOA 130 first edition
In order to understand where is 430 nm I just looked at one of my Sun sprectrums. It is the Fe 430.774 nm or 4307.74 Å line
I made that spectrum with my LISA Spectrograph on Takahashi TOA 130 first edition
regards Rainer
Observatorio Real de 14
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Observatorio Real de 14
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Re: Sun in three lights- 13th November 2020
An interesting subject about the colouring of our images, as neither Ha or Cal-K/H etc., (not including WL), is in reality that which our eyes could see if viewed without filtering (A VERY-DANGEROUS THING TO DO ANYWAY).
So even though grey-scale images (as often posted here) could be nearer the actual real-colour, to make the interesting-artefacts stand-out more - colouring the images can often assist the final-result.
Obviously though, to make images "aesthetically-pleasing" is (in my opinion) a nice way of showing one's artwork and in many cases creates a very memorable image above and beyond the same-image in grey-scale...
This agrees with what has been said above...
Thanks
Terry
So even though grey-scale images (as often posted here) could be nearer the actual real-colour, to make the interesting-artefacts stand-out more - colouring the images can often assist the final-result.
Obviously though, to make images "aesthetically-pleasing" is (in my opinion) a nice way of showing one's artwork and in many cases creates a very memorable image above and beyond the same-image in grey-scale...
This agrees with what has been said above...
Thanks
Terry
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Re: Sun in three lights- 13th November 2020
Stu:
What a set of clean and crisp images of the Sun in 3 lights.
Thanks for sharing them.
Eric.
What a set of clean and crisp images of the Sun in 3 lights.
Thanks for sharing them.
Eric.
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Re: Sun in three lights- 13th November 2020
Nice spectrum, Rainer. That’s an expensive piece of kit!
Yes, it’s a line from ionised iron. Technically it’s called G-band. In very close views of granulation, in hi-res, this wavelength can show bright Filigree structures, which are regions of enhanced magnetic field between granules (intergranular lanes) https://iopscience.iop.org/article/10.1 ... .text.html
It would be better to have a narrower bandwidth (2nm rather than 10nm), but these get expensive.
Stu.
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Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Sun in three lights- 13th November 2020
Many thanks, everyone.
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/
Re: Sun in three lights- 13th November 2020
Very nice session! I like the side-by-side montage in particular; it is really interesting to quickly compare structures in the different wavelengths. Unfortunately I seldom have clear skies long enough to change scopes and filters before the clouds are back.
Frank
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Re: Sun in three lights- 13th November 2020
Very well done !
By the way, G-band is a CH band, not an iron band.
By the way, G-band is a CH band, not an iron band.
Christian Viladrich
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Re: Sun in three lights- 13th November 2020
Excellent images Stu! Love the disks. I've thought about getting a 430nm filter too for WL. Hoping there is some sun tomorrow, think it will be quite blustery so hopefully the blue bits behind the clouds will appear for long enough for me to do something productive.
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Re: Sun in three lights- 13th November 2020
Fantastic Stuart, still clouded out here in the South West.
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Lunt 60mm Double Stack HA
80ed WL+ Lunt Hershal Wedge + Badder K-Line filter.
100mm AR + Lunt b1800 Ca-K module.
Neq6 Eq Mount.
2.7m Pulsar Dome.
11in Celestron SCT + White Light Filter.
70mm AR Stellavue.
12inch OO Newtonian.
Eq8 r Pro Mount.
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Re: Sun in three lights- 13th November 2020
Thanks, Christian.christian viladrich wrote: ↑Sat Nov 14, 2020 3:36 pm Very well done !
By the way, G-band is a CH band, not an iron band.
My understanding is that it’s a broad band comprising a mixture of CH absorption and closely spaced iron absorption lines. Maybe CH is the main contributor? Mistakenly I suggested ionised iron, but checking on the web the contribution of iron to the G-band apparently comes from neutral iron. Would it be more correct to say that the band arises from CH and Iron, or just CH?
Cheers
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: Sun in three lights- 13th November 2020
Hi Mark,marktownley wrote: ↑Sat Nov 14, 2020 4:06 pm Excellent images Stu! Love the disks. I've thought about getting a 430nm filter too for WL. Hoping there is some sun tomorrow, think it will be quite blustery so hopefully the blue bits behind the clouds will appear for long enough for me to do something productive.
The 430nm filter certainly seems to enhance the faculae compared with the 540nm filter. I’ll do a side-by-side, including red at some point.
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: Sun in three lights- 13th November 2020
Hi Stu,
Fabulous FDs. I also enjoyed reading the conversation and have learnt from it. Thanks!
Alfred
Fabulous FDs. I also enjoyed reading the conversation and have learnt from it. Thanks!
Alfred