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solar proms with my spectroscope lately

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#1 chrishalpha2017

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Posted 26 May 2020 - 11:01 PM

Hello guys,

the sun's still shining here in Paris and despite partial lockdown I can still watch the sun with my spectroscope through my little window under the rooftop smile.gif

 

Here are some recent pics  but this time I wanted to experience the Secchi experience with a 600 l/mm diffraction grating instead of the 1200l/mm grating that I usually use..

 

Secchi described in his book that he was given a grating by rutherford and that the dispersion gave him the dispersion of his 7 prisms spectrocope : the grating had about 600 l/mm and the collimator focal lenght is 130mm (mine is 180mm).

 

The results are interesting : the image is more detailed even though I have to open the slit less wider. An interesting fact compared to the use of the 1200 l/mm is the fact that the chromosphere "ribbon" is much less thinner and that the spicules are more easily seen.

 

19 mai 20 protu.jpg

 

5ebec0b84efda_15mai20test2.jpg.0f2aa2796a2b214089cb0b31445a6b4b.jpg

 

5ebef6b31afae_essai.jpg.8df9902208875e487d0f9df8dcd37575.jpg

 

essai 23++.jpg

 

dss++.jpg

 

25 main 20 essai 2.jpg

 

600t base protu barlow.jpg

 

 

 

 

 

 


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#2 UniversalMaster

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Posted 27 May 2020 - 02:47 AM

Very nice! Do you have a full spectrohelioscope or do you just let the sun scan across the slit and assemble the line spectrograms?

Which spectroscope do you use?

#3 chrishalpha2017

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Posted 27 May 2020 - 06:25 AM

https://youtu.be/or12v5vBTzY

 

I just use a spectroscope (homemade) with a 1200l/mm  reflection grating. There is no scanning ;  I use Angelo Secchi 's technique from his book "Le Soleil".

 

You just have to manage to have the slit of the spectroscope tangent to the sun's limb and observe the h alpha line in the spectrum.


Edited by chrishalpha2017, 27 May 2020 - 06:30 AM.


#4 chrishalpha2017

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Posted 27 May 2020 - 06:32 AM

fente large.jpg

 

here is a drawing from his book that explains how it works

 

You can use a thin slit to detect the presence of the prominence and then; if the sky is clear enough you can open the slit a bit more to see the prominence completely.

 

 

 

 



#5 UniversalMaster

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Posted 27 May 2020 - 08:59 AM

Yes, that is pretty cool. I tried this once

http://www.astrosurf...romo/chromo.htm

when my spectroscope was functional. Plan was to build a complete spectrohelioscope, but I never managed to do so :-)

The solar spectrum by itself is actually pretty nice looking in an eyepiece!

#6 chrishalpha2017

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Posted 08 June 2020 - 01:23 AM

yes, its  the same technique but they lack high definition a lot as they didnt sample properly at the time ; it was just an experiment they tried :)

This website is pretty old and it inspired me a lot then to make my own :)




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