Big blue and CaK vs Ha comparison, 18 May

[Starman]

Hi all,

Here are a couple of shots from the 18th of May. The full disk composite is made up of two 6-pane mosaics - one for the surface and one for the proms. CaK proms are quite faint and much harder to see than their Ha counterparts. The second image compares the main active region (10956) in CaK and Ha. Initially they may look pretty different, however look closely and the similarities are there to be picked out.

[Andrew*]

:shock:

there's no beating this guy, is there?!?

stunning images as usual.

Andrew

[GazOC]

The Cak proms look impressive, I don't think I've seen them before.

[Kaptain Klevtsov]

Very nice Pete.

"Dear Santa, ....."

Captain Chaos

[maroon bells]

Very impressive, I prefer the Ha as the detailing is more interesting and obviously because of the colour it looks more sun like.

[Starman]

Thanks for the comments

There's more contrast in the CaK image and it stands up much better against the seeing conditions. The biggest bonus with Ha are the filaments and prominences of course.

Colour is largely irrelevant as it's made up anyway

[maroon bells]

Oh by the way you've got the labeling wrong on the side by side pictures.

[Starman]

So I have - thanks for pointing that out. It's correct now.

[SteveL]

Amazing images...

OK, noob question here... what is it that CaK sees and ha doesnt... and vice versa?

[barkis]

Powerful looking images Pete. There is a vibrancy emanating from them you can almost feel.

Ron.

[Starman]

Thanks all.

SteveL - CaK picks out the light from calcium ions while h-alpha picks out light emitted by glowing hydrogen. In terms of what you are seeing, CaK sees thel layer just above the photoshere and is good at picking out the super granulation network (calcium ions like the edge of the super-granulation cells). H-alpha sees the layer above this and out to quite a height (this includes enough depth to see the proms as well). H-alpha light is bright enough to block some of the CaK features but some still shine through. Some very bright proms also include calcium ions as well as the normal hydrogen component.

[SteveL]

Thanks for the explanation sir...

[jonifive]

WOW! Showed the wife, her best mate and my kids and they were all amazed. The Mrs said I still can't have one

[dazza1639]

Stunning Pete, Really amazing images.

Darren