Atlas of Unblended Solar Lines

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Cschur
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Atlas of Unblended Solar Lines

Post by Cschur »

Hi all,

Looking for a great list of spectral lines to aim your spectroheliograph at? Look no further:

http://www.physics.uq.edu.au/people/nie ... c_data.pdf


Chris


Chris Schur

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Birch Mesa Observatory, Payson Arizona

Clear Creek Canyon Observatory, Happy Jack, Arizona
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Re: Atlas of Unblended Solar Lines

Post by p_zetner »

Hi Chris.

It's an interesting list but I'm not sure how useful for spectroheliography.

It looks like all of these lines are very narrow, relatively weak and definitely photospheric. Unless your spectral resolution is significantly better than 0.1 Angstroms, you will be looking mostly at the continuum outside of the line. Even if you had good enough resolution to actually sit within one of these lines, you'd basically be looking at the continuum (photospheric surface) anyway!

A number of these lines are useful for Zeeman effect studies with sufficient spectral resolution. I think they were singled out for study in this thesis because they are unblended and the line profile associated with a known atomic transition can thus be measured accurately.

Cheers.
Peter.


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Re: Atlas of Unblended Solar Lines

Post by Cschur »

Peter, I think for identification purposes, this list will be useful for finding individual lines in the forest of lines. Maybe you can find a list for lines useful for spectroheliographs? ;)

Chris


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Re: Atlas of Unblended Solar Lines

Post by Merlin66 »

The BASS solar atlas and the associated 20 page pdf (!) will give you more than you're looking for!
http://bass2000.obspm.fr/solar_spect.php

(The pdf link is at the bottom of the page)


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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: Atlas of Unblended Solar Lines

Post by p_zetner »

Hi Chris.

I've been researching appropriate lines for some time and these are the ones I'll be investigating once Old Man Winter loosens his icy grip and allows me to start imaging.

3889, CN Bandhead
- photosphere
- high facular contrast

3934, CaII K
- chromosphere,
- comparison of K1, K2, K3 spectral regions
- velocity studies of active regions / prominences.

3968, CaII H
- same as CaII K (?)
- might also check CaII ir triplet at 8498, 8542, and 8662Å

4861, HI beta
- chromosphere
- interesting differences with H alpha

5167, 5173, 5184, MgI b
- photosphere (chromosphere in line core)
- high facular contrast

5420, MnI
- photospheric line showing chromospheric features (active research as to why!)

5876, HeI D3
- upper chromosphere
- interesting black plage and bright limb
- comparison with He 10830 ir images (http://www.kis.uni-freiburg.de/index.php?L=1&id=457)
- magnetic properties (Hanle effect) proms

5890, 5896, NaI D
- photosphere (chromosphere in line core)

6563, HI alpha
- chromosphere
- velocity studies of active regions / prominences.

Some possible lines to measure magnetic fields by Zeeman effect:
4475, FeI, (g=2.46)
4744, MnI, (g=4.50 ?)
5069, FeI, (g=2.06)
5215, FeI, (g=2.25)
6303, FeI, (g=2.5)


I agree with Ken. The BASS2000 solar atlas and the associated 20 page pdf are indispensible.

Peter.


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