23June2022: AR13038 - Spectral sweep through H alpha.

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23June2022: AR13038 - Spectral sweep through H alpha.

Post by p_zetner »

Hi Everyone.

Part of my June 23 spectroheliography session was devoted to experimenting with a barlow on the telescope (C4 NexStar with Celestron barlow) for a more magnified image scale. At first, I didn't think much of the results because of severe vignetting with the barlow. On closer inspection, though, the imaging didn't turn out too badly with some cropping. Instead of posting a single image, I've decided to post an animated series of images taken at various wavelengths, stepping from the red wing to blue through the H alpha line. That's a result of improvements I've made to speed up and automate my image processing.

Here is the area of the solar disk I imaged (roughly bounded by the red box).
20220624041352Mh_mod_siz.jpg
20220624041352Mh_mod_siz.jpg (53.69 KiB) Viewed 524 times
Here is the animation.
23Jun2022_Halpha_133817_SpecSweep_siz2_lvls.gif
23Jun2022_Halpha_133817_SpecSweep_siz2_lvls.gif (8.18 MiB) Viewed 524 times
Cheers.
Peter


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Re: 23June2022: AR13038 - Spectral sweep through H alpha.

Post by p_zetner »

Here is a cropped version showing only the active region.
23Jun2022_Halpha_133817_SpecSweep_siz_lvls_crop.gif
23Jun2022_Halpha_133817_SpecSweep_siz_lvls_crop.gif (2.59 MiB) Viewed 523 times


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Re: 23June2022: AR13038 - Spectral sweep through H alpha.

Post by marktownley »

That is pretty impressive Peter!


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Re: 23June2022: AR13038 - Spectral sweep through H alpha.

Post by Montana »

I really do like the animation :bow :hamster:

Alexandra


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Re: 23June2022: AR13038 - Spectral sweep through H alpha.

Post by p_zetner »

Thanks for your comments, Mark and Alexandra.

There's actually some interesting information hidden in the animations. If you look at features in the red and blue wings of the H alpha line (symmetrically spaced around line centre) they are actually quite different. This is because of their motions and the corresponding Doppler shifts in their absorption line centres. Here is a montage of images in the red wing, line centre and blue wing of H alpha.
Montage_26-51-76_proc.jpg
Montage_26-51-76_proc.jpg (475.99 KiB) Viewed 485 times
The interesting comparison is between the top and bottom images. I thought I would make this more obvious by posting (yet another) animation! This is simply an animation involving the two red / blue wing images and a blending "morph" between them.
Transition_26-76_crop_siz_box.gif
Transition_26-76_crop_siz_box.gif (1.31 MiB) Viewed 485 times
The start of the animation loop is in the red wing and a bounding box appears there. Interesting stuff happens inside the box where you can see features receding from us (at 137 km/s) at the beginning of the loop and then approaching us (at 137 km/s) by the end of the loop. You can see that the fibrils (roughly oriented East-West ie. left - right) become more apparent in the blue wing, indicating they have a velocity component away from the solar surface. There are also features which start with a large motion downward and then nearly disappear in the blue wing.

The spectrum associated with this region is also pretty complex as a consequence of these motions. At some point I'll post a sample.
Cheers.
Peter


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Re: 23June2022: AR13038 - Spectral sweep through H alpha.

Post by Carbon60 »

Excellent, Peter. Very impressive and informative.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
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Re: 23June2022: AR13038 - Spectral sweep through H alpha.

Post by highfnum »

yep something thats fun with SHG


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