MiniSHG with Baader 7nm H alpha filter

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Merlin66
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MiniSHG with Baader 7nm H alpha filter

Post by Merlin66 »

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_7nmHa filter.JPG
MiniSHG_7nmHa filter.JPG (211.91 KiB) Viewed 791 times


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Re: MiniSHG with Baader 7nm H alpha filter

Post by Merlin66 »

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.
270921_Ha.gif
270921_Ha.gif (547.51 KiB) Viewed 766 times
The solar image shows the results from this full scan.
085111_Ha.jpg
085111_Ha.jpg (116.55 KiB) Viewed 766 times


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Re: MiniSHG with Baader 7nm H alpha filter

Post by Montana »

Terrific work :bow :bow :bow it is so exciting :)

Alexandra


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Re: MiniSHG with Baader 7nm H alpha filter

Post by Merlin66 »

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....


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Re: MiniSHG with Baader 7nm H alpha filter

Post by marktownley »

Excellent result Ken!


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