Sun in three lights- 13th November 2020

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Sun in three lights- 13th November 2020

Post by Carbon60 »

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:
Image20201113_Sun_3-Lights_Montage by Stuart Green, on Flickr
... and the individual images....

Image20201113_CaK_FD_Mono by Stuart Green, on Flickr

Image20201113_CaK_FD_colour by Stuart Green, on Flickr

Image20201113_WL_430_FD_mono by Stuart Green, on Flickr

Image20201113_WL_430_FD_colour by Stuart Green, on Flickr

Image20201113_Ha_FD_mono by Stuart Green, on Flickr

Image20201113_Ha_FD_colour by Stuart Green, on Flickr

Thanks for looking.

Stu.


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Re: Sun in three lights- 13th November 2020

Post by rsfoto »

Hi Stu,

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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Re: Sun in three lights- 13th November 2020

Post by DeepSolar64 »

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

Post by DeepSolar64 »

rsfoto wrote: Fri Nov 13, 2020 5:41 pm Hi Stu,

Excellent images. 430 nm is more to the UV / Purple side so why that brown colour ? :-)

What filter did you use ?
I was thinking 540nm green continuum filter.


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Re: Sun in three lights- 13th November 2020

Post by Carbon60 »

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.


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Re: Sun in three lights- 13th November 2020

Post by DeepSolar64 »

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


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Re: Sun in three lights- 13th November 2020

Post by rsfoto »

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.
Hi Stu,

Sorry for my question, pure curiosity ...

:oops:


regards Rainer

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Re: Sun in three lights- 13th November 2020

Post by Carbon60 »

rsfoto wrote: Fri Nov 13, 2020 7:00 pm
Hi Stu,

Sorry for my question, pure curiosity ...

:oops:
No problem, Rainer. Better to be curious and ask... :)

Stu.


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Re: Sun in three lights- 13th November 2020

Post by rsfoto »

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 :o

I made that spectrum with my LISA Spectrograph on Takahashi TOA 130 first edition :mrgreen:

Sun-010SP-0013s-Labeled-graph.jpg
Sun-010SP-0013s-Labeled-graph.jpg (403.36 KiB) Viewed 700 times


regards Rainer

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Re: Sun in three lights- 13th November 2020

Post by EGRAY_OBSERVATORY »

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


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Re: Sun in three lights- 13th November 2020

Post by ffellah »

A lovely set and presentation Stu

Franco


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Re: Sun in three lights- 13th November 2020

Post by eroel »

Stu:
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

Post by Carbon60 »

rsfoto wrote: Fri Nov 13, 2020 8:05 pm 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 :o

I made that spectrum with my LISA Spectrograph on Takahashi TOA 130 first edition.
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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Re: Sun in three lights- 13th November 2020

Post by Carbon60 »

Many thanks, everyone.

Stu.


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Re: Sun in three lights- 13th November 2020

Post by LTHB »

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

Post by Montana »

Lovely images Stuart, even the brown one :lol:

:bow :hamster:
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Re: Sun in three lights- 13th November 2020

Post by christian viladrich »

Very well done !

By the way, G-band is a CH band, not an iron band.


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Re: Sun in three lights- 13th November 2020

Post by marktownley »

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

Post by Stardust5858 »

Fantastic Stuart, still clouded out here in the South West.


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Re: Sun in three lights- 13th November 2020

Post by dhkaiser »

Nicely done.


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Re: Sun in three lights- 13th November 2020

Post by Carbon60 »

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.
Thanks, Christian.
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

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Re: Sun in three lights- 13th November 2020

Post by Carbon60 »

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.
Hi Mark,
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.


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Re: Sun in three lights- 13th November 2020

Post by yltansg »

Hi Stu,

Fabulous FDs. I also enjoyed reading the conversation and have learnt from it. Thanks!

Alfred


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