Very very very old spectroheliograms

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Wah
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Very very very old spectroheliograms

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Last edited by Wah on Tue Feb 17, 2015 5:36 am, edited 1 time in total.


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Re: Very very very old spectroheliographs

Post by swisswalter »

Hi Wah

thanks for digging that out


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Re: Very very very old spectroheliographs

Post by Merlin66 »

Thanks for that Wah!
It shows dramatically how the advent of the digital SHG is capable of producing results only dreamed about by the professionals a few years ago.


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Re: Very very very old spectroheliograms

Post by marktownley »

Way cool! Interesting to see how things have moved on.


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Re: Very very very old spectroheliograms

Post by Derek Klepp »

Thanks Wah


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Re: Very very very old spectroheliograms

Post by Montana »

Wow! I think they are pretty impressive for 1893 :bow :bow :bow

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Re: Very very very old spectroheliograms

Post by Merlin66 »

These were taken using the Deslandres spectroheliograph...a slightly different design from the Hale version...
I believe the first Ha spectroheliogram wasn't taken until 1909. (the early photographic plates being more sensitive in the blue, and had to wait until further panochromatic plates became available around 1902.)
Last edited by Merlin66 on Tue Feb 17, 2015 11:10 pm, edited 1 time in total.
Reason: spelling!


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Re: Very very very old spectroheliograms

Post by Wah »

What is Deslandres or Hale spectroheliograph?
Can you give me some more details?

I have found the earilest Ha images in the link above was 1908, it's after 1902.
http://bass2000.obspm.fr/gallery2/main. ... temId=9764


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Re: Very very very old spectroheliograms

Post by Merlin66 »

Wah,
Hale describes his instrument in:
http://adsabs.harvard.edu/abs/1929CMWCI.388....1H
There's a brief description of Deslandres one on the Meudon Site
http://www.obspm.fr/the-meudon-spectroh ... ml?lang=en
Hale also wrote an article on the SHG and SHS in ATM, Book one, p 180-214


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Re: Very very very old spectroheliograms

Post by highfnum »

wow nice find - thx
images not that bad from so long ago


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Re: Very very very old spectroheliograms

Post by Spectral Joe »

Here's one from 1892, from Hale's Kenwood spectroheliograph.
Kenwood K spectroheliogram 1892.jpg
Kenwood K spectroheliogram 1892.jpg (58.67 KiB) Viewed 4682 times
The instrument it came from looked like this:
Kenwood spectroheliograph.jpg
He used this instrument from 1892 until 1895,when it, with the rest of Kenwood Observatory, became part of Yerkes Observatory. The white hoses are for a hydraulic drive (klepshydra, or water clock) that drove the entrance and exit slits using the linkages that can be seen. After 1903 he used the Rumford spectroheliograph:
Rumford spectroheliograph.jpg
Rumford spectroheliograph.jpg (15.78 KiB) Viewed 4682 times
This was built specifically for the 40 inch refractor, and scanned in declination with the RA drive running as normal. In 1904 Hale moved his operation to Mount Wilson, supposedly temporarily but ultimately permanently. The spectrohelioscope, described in the 1929 paper, was developed by Hale in 1923 as a pet project in his health related early retirement from the directorship of Mount Wilson. He described it in a 1924 paper,and later in a series of articles popularizing the instrument. Many variants have followed.


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Re: Very very very old spectroheliograms

Post by Merlin66 »

Joe,
Thanks for that.
I did manage to find similar illustrations and the Hale references.
Also, prior to the introduction of red sensitive film (around 1903) Hale did some spectroheliograms in Hb.....


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Re: Very very very old spectroheliograms

Post by Spectral Joe »

Mount Wilson's first documented Ha work was in March, 1908, as shown in this snip from the 1908 annual report:
MWO 1908 report snip.PNG
MWO 1908 report snip.PNG (73.67 KiB) Viewed 4681 times
On page 204 of the 1912 annual report there is an interesting statement on their investigation into the state of the art in sensitizing plates, and the non scientific nature of the process. I recently got to see the room at Mount Wilson, built into the side of a hill between the Snow and 60 foot tower telescopes, used for special photo chemistry. The underground room had the steady temperature required for the work.


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Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!
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