Spectroheliograph image example

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Spectral Joe
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Spectroheliograph image example

Post by Spectral Joe »

There has been some discussion of "dispersive imaging" here lately, with some curiosity about what can be accomplished.
Cashing in on some unusually good seeing, here are two images that illustrate what a compact (1.25 meter FL) spectroheliograph can do. First, my image.

PSO053012.tif

Next, Big Bear Solar Observatory's image, taken at nearly the same time.

BBSO053012.tif

Both processed the same. BBSO's patrol scope is 100mm aperture, 0.25 Angstrom bandpass.
Mine is 75mm aperture, 0.35 Angstrom bandpass.
The homebuilt gadget is pretty competitive.


Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything.
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!
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Re: Spectroheliograph image example

Post by swisswalter »

Hi Joe

impressive result :bow:


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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Re: Spectroheliograph image example

Post by Merlin66 »

Excellent results!
Well done.
The only thing you missed was a small flare just left of centre ;-)
(Just goes to show what can be done with "amateur" equipment and a bit of rigor and dedication.....)


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"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: Spectroheliograph image example

Post by PEterW »

What image generation setup did you use? Was this moving slit or drift scanning. I also guess that there has been no stacking of the image, just a bit if wavelets and other post processing?
I am really impressed, most of the amateur spctrohelio images I see are riddled with streaky artefacts that makes one worry if it is worth the bother. There seemed to have been a spike in interest around 2004, with nothing really recently.mI really hope we can look forward to these kind of results with Merlins new idea... We all await with interest.

Joe have you got any Doppler highlighting images or magnetic field maps.... The really cool stuff that dispersive imaging really opens up!


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Re: Spectroheliograph image example

Post by marktownley »

Oh yes, that's good! Joe, we need to see more of your work 8) You have a lot of potential converts here ;)


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Re: Spectroheliograph image example

Post by Spectral Joe »

There's a description here: http://www.cloudynights.com/ubbthreads/ ... art/1/vc/1

Some images here: http://www.cloudynights.com/ubbthreads/ ... art/1/vc/1

and more info and photos near the bottom here: http://www.eyes-on-the-skies.org/shs/

Here's a doppler image of last year's AR1165:



Made with two images taken 0.3 Angstroms apart.

There is some streaking, but an FFT takes it right out. That and some contrast expansion is all I do, these are all single exposures. I'm in the midst of building a new detector that uses a Kodak KLI2113 3 line by 2098 pixel CCD, the main camera part is done and what remains is the timing generator. This detector will give three wavelength shots all at one time.


Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything.
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!
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Re: Spectroheliograph image example

Post by Merlin66 »

Unfortunately life isn't that simple - yet....
The telescope focal length gives the plate scale at the entrance slit - needed for surface resolution.
In the electronic SHG the wavelength resolution is also dependent on the focal length of the imaging system and the slit gap. This slit gap must then be scanned across the solar disk and then "reassembled" to make a complete image.
I'm sure, as we move up the learning curve, we will find other alternative solutions....
(BTW Meade raised a Patent on the electronic scanning method - after it had been given to the public domain by Ronde and Defourneau etc!!!)


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: Spectroheliograph image example

Post by Phil_Rousselle »

Hello,
Very nice realization and good images


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Re: Spectroheliograph image example

Post by p_zetner »

Fabulous spectroheliogram, Joe!

Is this H alpha line centre? Do you have images for the wings?

Cheers.
Peter.


defourneau

Re: Spectroheliograph image example

Post by defourneau »

I am new, Mr. Ken Harrison invited me on this forum.
Alas, I do not speak English.
You will have with me, the bad translations of Google.
I built in 2002 a spectroheliograph with webcam.

http://www.astrosurf.com/cieldelabrie/sphelio.en.htm

a recent image:

http://www.astrosurf.com/cieldelabrie/s ... soleil.gif

Je suis nouveau, M. Ken Harrison m’a invité sur ce forum.
Hélas, je ne parle pas l’anglais.
Vous aurez avec moi, les mauvaises traductions de Google.
J’ai construits en 2002 un spectrohéliographe à webcam.
http://www.astrosurf.com/cieldelabrie/sphelio.en.htm
Une image récente :
http://www.astrosurf.com/cieldelabrie/s ... soleil.gif


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Re: Spectroheliograph image example

Post by solarchat »

feel free to post in French, there is a translate button on the top left


Stephen W. Ramsden
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Re: Spectroheliograph image example

Post by colinsk »

That is very compact. Nice work!


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Re: Spectroheliograph image example

Post by rsfoto »

I am new, Mr. Ken Harrison invited me on this forum.
Alas, I do not speak English.
You will have with me, the bad translations of Google.
I built in 2002 a spectroheliograph with webcam.

http://www.astrosurf.com/cieldelabrie/sphelio.en.htm

a recent image:

http://www.astrosurf.com/cieldelabrie/s ... soleil.gif

Je suis nouveau, M. Ken Harrison m’a invité sur ce forum.
Hélas, je ne parle pas l’anglais.
Vous aurez avec moi, les mauvaises traductions de Google.
J’ai construits en 2002 un spectrohéliographe à webcam.
http://www.astrosurf.com/cieldelabrie/sphelio.en.htm
Une image récente :
http://www.astrosurf.com/cieldelabrie/s ... soleil.gif

Hi,

Very interesting work you are doing.

Question: You have a reflective grating. ¿ Could one use a transmission grating like the StarAnalyser with 100 lines per mm ?

Thanks for your comments in advance


regards Rainer

Observatorio Real de 14
San Luis Potosi Mexico

North 22° West 101°
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Re: Spectroheliograph image example

Post by Merlin66 »

Rainer,
Daniel will probably reply..but I would think there's a couple of reasons against the transmission grating being used in the spectrohelioscope.
You really need a large dispersion to be able to work within the Ha bandwidth, this is not achieved with generally less than 600 l/mm gratings. 1200 or higher are prefered. Also there may be an adverse heating effect (?) using a large scope with a plastic replica transmission grating....


"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
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Re: Spectroheliograph image example

Post by rsfoto »

Hi Ken,

Thanks. Maybe someday I will get a grating like the oine is needed. Sounds like an interesting project :hamster:


regards Rainer

Observatorio Real de 14
San Luis Potosi Mexico

North 22° West 101°
defourneau

Re: Spectroheliograph image example

Post by defourneau »

dans un Spectrohéliographe le plus important c'est le réseau!
il faut un réseau en réflexion de 1800 à 2400 traits/mm
j'ai essayé des réseaux en transmission cela fonctionne mais pas aussi bien
désolé, il faut au moins 1000 traits par mm (environ 100 à 150 euros)
:(
une image de ce matin

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Re: Spectroheliograph image example

Post by marktownley »

Nice!


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Re: Spectroheliograph image example

Post by swisswalter »

Hi Daniel

interesting result. Why would you do that with such an expensive complicated tool if you can use a simple PST :oops:


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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Re: Spectroheliograph image example

Post by Merlin66 »

Walter,
the difference is that it's like having 8 or 10 PST's for the price of one!!
You can tune into any wavelength you like...what about imaging at <0.5A in Ha, Hb, Fe, Na, Ca and many more lines???


"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
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Re: Spectroheliograph image example

Post by defourneau »

bonjour Walter,
Merlin a raison le spectrohelio permet de faire des images dans toutes les longueurs d'ondes
sa résolution est inférieure au PST mais en tournant le réseau ou en jouant sur la largeur de la raie je peux faire des images impossibles à la PST
exemple: image de structure "presque" identique à celle de SOHO EIT à 30nm

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Re: Spectroheliograph image example

Post by swisswalter »

Hi Ken, Hi Daniel

thank you very much for your explanations and the example. Now. I see the point.


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
MissBluesArtAstro

Re: Spectroheliograph image example

Post by MissBluesArtAstro »

Hello Joe
This is the first time I've seen, as close to the movements of protu, faculae around! thank you, it is ;) very interesting


defourneau

Re: Spectroheliograph image example

Post by defourneau »

Les bandes sombres.
Grâce à un traitement sur le contraste des images H alpha prises au spectrohéliographe
Nous pouvons apercevoir de grandes bandes sombres allongées, invisibles autrement.
Ces rubans semblent liés au magnétisme solaire car les filaments se développent sur ces bandes.
Puisque ces bandes sont invisibles sur les images H alpha classiques, existent-elles vraiment, ou sont elles créées par mon traitement de l’image ?
Elles existent ! Je retrouve leurs dessins sur les images de SOHO et SDO. Non pas en H alpha, mais vers 30nm de longueur d’onde. L’image SDO est jointe pour la date du 29/07/2012.
Ces rubans ne sont pas répartis au hasard. Ils jouxtent ou séparent, les plages faculaires.
Les plages faculaires sont brillantes car la chaleur bloquée sous les bandes ne peut être stockée longtemps. Elle contourne les bandes et sort sous forme de facules brillantes.
De la même façon tout comme les taches solaires, nous pouvons affirmer que ces rubans sont plus froids que leur environnement, étant donné que leur émission est moindre que le continuum.
Ces rubans peuvent atteindre une longueur d’un rayon solaire.
Le « contraste augmenté » est-il un nouveau moyen d’étudier le soleil ?
Amitiés,
Daniel.

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defourneau

Re: Spectroheliograph image example

Post by defourneau »

bonjour
voici la métamorphose d'une citrouille, le soleil au spectrohéliographe

http://www.astrosurf.com/cieldelabrie/s ... 120731.gif


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Re: Spectroheliograph image example

Post by marktownley »

Excellent and very interesting. I have recorded these dark areas (though nowhere near as contrasty as yours) in my CaK filter, I brought it up a while ago on a different forum and everyone just said it was my post processing. I knew they were real features then despite what people said. They're visible on the SDO images too http://sdo.gsfc.nasa.gov/assets/img/lat ... 4_1600.jpg


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Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
defourneau

Re: Spectroheliograph image example

Post by defourneau »

Merci! Les bandes existent réellement.
Je suis content que tu aies la même chose.
A deux la vérité est plus forte.
je joins une image de ce matin.

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