The attached screen shot shows a few things:
1. The Baader 7nm Ha filter actually has peak transmission at 6580A.
2. The movements in the solar surface are clearly seen as "wiggles" in all the absorption lines.
The measured resolution R=33529 and the dispersion 0.0635 A/pixel match up pretty well with the SimSpec results for the MiniSHG.
MiniSHG with Baader 7nm H alpha filter
- Merlin66
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MiniSHG with Baader 7nm H alpha filter
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Re: MiniSHG with Baader 7nm H alpha filter
I've extracted a few frames from a full solar disk, 9 sec scan, which show the "normal" cropped H alpha spectrum used to re-construct the SHG image. ( Cropped to 1150 x 170 for the GIF)
You can see the "wiggles" in the Ha line caused by the surface features and a couple of sunspots tracking across.
The wiggles do impact on all lines (?) but I accept the telluric would normally only show the seeing. The solar image shows the results from this full scan.
You can see the "wiggles" in the Ha line caused by the surface features and a couple of sunspots tracking across.
The wiggles do impact on all lines (?) but I accept the telluric would normally only show the seeing. The solar image shows the results from this full scan.
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http://astronomicalspectroscopy.com
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Re: MiniSHG with Baader 7nm H alpha filter
OK,
I think I've found the issue.
The "sharpening" process appears to have generated the artefacts in the absorption lines.
The wiggles are obvious in the un-sharpened stack image of the H alpha line, but not in the telluric lines....
I think I've found the issue.
The "sharpening" process appears to have generated the artefacts in the absorption lines.
The wiggles are obvious in the un-sharpened stack image of the H alpha line, but not in the telluric lines....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: MiniSHG with Baader 7nm H alpha filter
Excellent result Ken!
http://brierleyhillsolar.blogspot.co.uk/
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