Walkthrough the CaK wavelength violet to red

[Merlin66]

I've prepared a GIF which walks through the CaK wavelength at a resolution of 0.18A.
Starts way out in the K1violet wing (1A), creeps in until the K2v region, just outside the core (0.2 offset) then the core CWL and then the same points moving outwards into the red wing.

I'm looking at ways and means of combining the images to better represent the views obtained with the Lunt filters (and others)
Enjoy!

CaK_K1v_core_K1r.gif (705.41 KiB) Viewed 591 times

[DeepSolar64]

Very nice work Ken! You are at the forefront of CaK/SHG imaging. I hope to see more of your magnesium work as well.

Thanks

James

[EGRAY_OBSERVATORY]

Interesting ken and keep up the good work

Terry

[Merlin66]

Thanks for the feedback!
I will process a similar series but showing the Proms in action and where the brightest proms can be found.

[marktownley]

This is brilliant Ken, you're giving me lots to think about for optimising my filter based CaK setup. These reference images are gold.

[ffellah]

Very nice and interesting, Ken.

Franco

[Montana]

Brilliant Ken is this done with the miniSHG?

Alexandra

[eroel]

Ken:
Very good walkthrough different wavelengths.
Best regards and thanks.
Eric.

[christian viladrich]

Well done Ken !
On my side, I am considering a 1.5A Ca K filter from Alluxa. Still, the spectral resolution would be much lower compared to the SHG.

[Merlin66]

Alexandra,
All the images were obtained from one MiniSHG 18 sec 16 bit SER video. Matt and I have been playing with the INTI software to make it more robust in the selection of target lines. This allows more precise wavelength selection across the target line.
I'm also preparing a similar animation for the Proms.

[Carbon60]

Excellent, Ken. Very interesting to see the changes across the series of images.

Stu.

[p_zetner]

Very nice, Ken.
Might I recommend more spectral “slices” for a smoother animation?
Here’s an example I posted in 2018.
viewtopic.php?f=8&t=25028
Cheers.
Peter

[p_zetner]

I'm looking at ways and means of combining the images to better represent the views obtained with the Lunt filters (and others)

For a discussion of simulating filter bandpass effects with SHG images you might want to check my thread in our very own SolarChat Reference Library entitled “‪Surface contrast in CaK for various filter bandpasses”.

viewtopic.php?p=225389#p225389

To give a reasonable simulation of Ca K filter performance, I used a weighted average of SHG frames across a spectral sequence, weighted in such a way to mimic a Gaussian filter profile. Further details are discussed in the thread.

The results are also shown in Figure 7.23 of Christian’s “Solar Astronomy” book.

Cheers.
Peter

[Merlin66]

Peter,
You are correct. I could have taken many more images....next time.
I just wanted to show the relative changes between the K3, K2 and K1 regions of the Ca II K line.
Sorry, I had overlooked your earlier work.