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.
Comparison of H-beta and H-alpha full-disk SHG images from Aug 7
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Comparison of H-beta and H-alpha full-disk SHG images from Aug 7
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
Fantastic images Douglas, the Hbeta shows the magnetic disturbance around the active regions very well indeed. This is simply the best
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Re: H-alpha and H-beta full disk SHG images from Aug 7
Very nice!
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Re: H-alpha and H-beta full disk SHG images from Aug 7
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
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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These pretzels are making me thirsty! (C.C.)
The Quark introduced me to this wonderful side of the hobby and the sun hasn’t disappointed yet.
Solar Equipment: Solar Spectrum RG-18 0.3A, Coronado Solarmax 90mm etalon Isle of Man SN-001, Tuscon SN-380 and Meade SM2, Lunt LS80 DS, Quark Chromosphere, Lunt 2" wedge, 2-Lunt CaK II 1200, Baader 3.8 and 5.0 solar film in 208mm cells, and 3D printed Sol'Ex SHG, Lunt 40mm
Coming Soon: Solar Spectrum CaK II <1A filter
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Re: H-alpha and H-beta full disk SHG images from Aug 7
See this conversation: viewtopic.php?p=349452#p349452hopskipson 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 for the main issues: viewtopic.php?p=347850#p347850hopskipson 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?
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.