CaK and CaH 11th Dec 2021

[Merlin66]

Still working with filters - trying to find the Holy Grail to suppress the parasitic light.
Some interesting filaments visible with a couple of proms. Both in CaK and CaH.


I did an "inverted" CaK to better show the fluffy "flocculation clouds" visible in CaK.
I misread G E Hale's earlier description from 1929 when he said "....that a distinctive term should be adopted, and I now propose the name flocculi for the regions on the Sun's disk which are shown only on photographs made with the spectroheliography" and believed that these "clouds" were the flocculation he was talking about. He was actually referring to the brighter lines between these formations.....:(:(

Enjoy!

[Saturnine]

Always interesting and informative, I always enjoy your posts and descriptions of what we're seeing in the images. Learning a bit more solar every time.

[Merlin66]

Thanks Jeff!
I honestly had to do a double take on the Hale "flocculi" description....
When you see the solar surface in the K3 line (centre of the CaK) it does look more like a flocculated surface than say the H alpha etc.
I'm surprised no-one appears to have commented on this CaK "surface"

[Saturnine]

Maybe to the untrained eye, like mine, the difference in appearance between CaK and CaH bands is too subtle, unless pointed out. Like a lot of things, a trained, knowledgeable eye can make out minor differences in appearance, shape, behaviour etc. that us numbies would never notice, but we're learning.