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
Atlas of Unblended Solar Lines
Atlas of Unblended Solar Lines
Chris Schur
----------------------------------
Birch Mesa Observatory, Payson Arizona
Clear Creek Canyon Observatory, Happy Jack, Arizona
----------------------------------
Birch Mesa Observatory, Payson Arizona
Clear Creek Canyon Observatory, Happy Jack, Arizona
- p_zetner
- Way More Fun to Share It!!
- Posts: 1644
- Joined: Sun Mar 18, 2012 4:59 pm
- Location: Winnipeg, Manitoba, Canada
- Has thanked: 166 times
- Been thanked: 719 times
Re: Atlas of Unblended Solar Lines
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.
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.
Re: Atlas of Unblended Solar Lines
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
Chris
Chris Schur
----------------------------------
Birch Mesa Observatory, Payson Arizona
Clear Creek Canyon Observatory, Happy Jack, Arizona
----------------------------------
Birch Mesa Observatory, Payson Arizona
Clear Creek Canyon Observatory, Happy Jack, Arizona
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: Atlas of Unblended Solar Lines
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)
http://bass2000.obspm.fr/solar_spect.php
(The pdf link is at the bottom of the page)
"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
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- p_zetner
- Way More Fun to Share It!!
- Posts: 1644
- Joined: Sun Mar 18, 2012 4:59 pm
- Location: Winnipeg, Manitoba, Canada
- Has thanked: 166 times
- Been thanked: 719 times
Re: Atlas of Unblended Solar Lines
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.
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.