Calcium K fest 10th Nov

[Montana]

Had a very happy day studying Calcium K with the PST and DMK41 camera.

2012-11-10 12-54-18 f colour by Alexandra's Astronomy, on Flickr

2012-11-10 CaK by Alexandra's Astronomy, on Flickr

2012-11-10 CaK f colour by Alexandra's Astronomy, on Flickr

and some wonderful Ellerman bombs in AR11610

2012-11-10 Ellerman bombs by Alexandra's Astronomy, on Flickr

Ellerman bombs at first seen at 3,5 and 7 O'clock, then in the second shot 3 and 5 have gone but a new one appears at 2 O'Clock.

Regards

Alexandra

[JamesF]

Lovely images. I'd never heard of Ellerman bombs before. I had to look up what they were

James

[cgarry]

I agree with James, lovely images. I didn't know what Ellerman bombs were either until google came to the rescue, so I have learned something today.

Cheers,

Chris

[scoobee]

wow, loving the images, time to google Ellerman bombs.

[DrRobin]

Stunning pictures, especially the close ups.

[Montana]

Thanks guys

Bit of a cheap plug but you could read this

http://www.stephenramsden.com/SOLARASTROPHOTOGRAPHY/Observing%20in%20Ca%20II%20K.pdf

Alexandra

[DrRobin]

Nice article you wrote there, very informative.

Can you see Ellerman bombs in Ha? My full disc images shows a small black spot in the 3 o'clock position, taken at 12: 14 but the close up taken at 12:40 doesn't show it. Of course it might be just different processing or a Registax artefact.

[Montana]

Hi Robin, yes, the most typical place to see an Ellerman bomb is actually in hydrogen alpha but they are very rarely seen on the centreline. You need to be looking in the far wings (either red or blue) and they appear as white spots that come and go in around 10 minutes. This is why CaK is good as it overlaps the far wings of Ha a little. If you saw a dark spot then this fits the theory that the 3 O'clock spot is an arch filament footpoint, these look very similar to the Ellerman bombs but do not disappear but stay the same. My 3 O'clock spot never moves, but I didn't have an Halpha comparison, but you have probably solved this

Alexandra

[JamesF]

A very interesting write-up, Alexandra. Every time I find out something new about the Sun I discover there's even more that I don't know Credit to you (and the others involved) for putting it together.

James

[sologuitarist61]

Beautiful images Alexandra

[Peter Drew]

I can confirm that you can see the EB's in Ha as I was observing them at the time. I was using a PST mod with a BF15, this setup gives a Ha tuning gradient across the disk which makes these objects more easily visible.

[DrRobin]

Thanks Peter and Alexandra. Looks like it wasn't an Ellerman Bomb I saw as it was black. Funny, when I didn't even know what they were I wasn't really bothered, now that I nearly caught one and didn't they are going to be on my hit list for the future.

[KE400]

Great images Alexandra, very nice indeed. Looks like you are teaching us all new stuff too, thanks

[Keiran]

That is really impressive, they are stunning images