Comparison of H-beta and H-alpha full-disk SHG images from Aug 7

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thesmiths
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Comparison of H-beta and H-alpha full-disk SHG images from Aug 7

Post by thesmiths »

Here's are two mosaics of H-alpha and H-beta side-by-side (which makes for easier comparison). H-beta is not as dramatic as H-alpha or Ca-K but has some nice subtle details. I haven't seen H-beta etalon images but that's probably because you need an extremely narrow bandwidth to see much contrast in H-beta.

For technical details on the imaging process, see the post in the Solar Radio, Magnetometry and Spectroscopy section: viewtopic.php?t=37449.

Click on the image to see at higher resolution.

H-beta (left) and H-alpha (right). 106mm aperture, 720mm focal length. Morning of August 7.
H-beta (left) and H-alpha (right). 106mm aperture, 720mm focal length. Morning of August 7.
070822-Hb-Ha-720mm-2400g-stacked.jpg (1.28 MiB) Viewed 1005 times
H-beta inverted (left) and H-alpha inverted (right).
H-beta inverted (left) and H-alpha inverted (right).
070822-Hb-Ha-720mm-2400g-stacked-inverted.jpg (1.28 MiB) Viewed 1005 times
Last edited by thesmiths on Tue Sep 27, 2022 11:48 pm, edited 6 times in total.


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Re: H-alpha and H-beta full disk SHG images from Aug 7

Post by Montana »

Fantastic images Douglas, the Hbeta shows the magnetic disturbance around the active regions very well indeed. This is simply the best :bow :hamster:

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Re: H-alpha and H-beta full disk SHG images from Aug 7

Post by marktownley »

Very nice!


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Re: H-alpha and H-beta full disk SHG images from Aug 7

Post by hopskipson »

Very nice images, Douglas!

Looking on my phone and trying to compare the images. To me it seems like the filaments are not as full and some seem transparent or missing features in the beta version. Kind of like we’re only seeing the lower levels?

I really like your limbs. There not the usual jagged edges that I get. 😕 Is that due to the stacking or some other processing? Thanks


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Re: H-alpha and H-beta full disk SHG images from Aug 7

Post by thesmiths »

hopskipson wrote: Thu Aug 11, 2022 4:05 pm To me it seems like the filaments are not as full and some seem transparent or missing features in the beta version. Kind of like we’re only seeing the lower levels?
See this conversation: viewtopic.php?p=349452#p349452
hopskipson wrote: Thu Aug 11, 2022 4:05 pm I really like your limbs. There not the usual jagged edges that I get. Is that due to the stacking or some other processing?
See this conversation for the main issues: viewtopic.php?p=347850#p347850

Stacking does help with smoothing out the limb edges. The main cause of jaggedness, I believe, is atmospheric turbulence, which would be evened out by stacking. But mount tracking errors can also cause jaggedness, but these would typically be asymmetrical -- i.e. stronger in one scan direction than the reverse direction.


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