Solar Imaging in Ca-K line 6th April 2021

[Nigella Bryant]

Hi all, could only get some Ca-K line imaging today as the clouds were fast moving.  70mm AR stopped down to 60mm. Processed in Autostakker3, ImPPG and Photoshop. Some lovely proms in Ca-K line today. 

[Kitsunegari]

Your calcium filter captures the proms very well, this is a sign you were shipped a very  good filter!

 

In comparison to my filter;  you should never consider selling it; as your center wavelength is  very close to the core line.   

 

[Nigella Bryant]

20 minutes ago, Kitsunegari said:

Your calcium filter captures the proms very well, this is a sign you were shipped a very  good filter!

 

In comparison to my filter;  you should never consider selling it; as your center wavelength is  very close to the core line.   

Thanks, that's really good to know. I thought it was the first time I used it. To be honest I didn't know there was an issue with cak filters the same as in ha in the quality. 

Edited April 6, 2021 by Nigella Bryant
More comment

[Kitsunegari]

21 minutes ago, Nigella Bryant said:

Thanks, that's really good to know. I thought it was the first time I used it. To be honest I didn't know there was an issue with cak filters the same as in ha in the quality. 

I would say that 70% of calcium filter owners cannot catch a prominence with a useable brightness, and 98% cannot catch the spicule layer.   Alot of people talk about bandwidth and spectrometers / double stacking  etc;  but the images captured are the real measurement tool.   No spicule layer,  = way off band or very wide band.

 

Lunt filters are typically centered at 393.4nm;  and the prominences really only pop out at 393.38nm.       The K-line core is 393.37nm,        and your filter is very close to the desired performance.

  Calcium.     Vs    H-alpha

[Nigella Bryant]

12 minutes ago, Kitsunegari said:

I would say that 70% of calcium filter owners cannot catch a prominence with a useable brightness, and 98% cannot catch the spicule layer.   Alot of people talk about bandwidth and spectrometers / double stacking  etc;  but the images captured are the real measurement tool.   No spicule layer,  = way off band or very wide band.

 

Lunt filters are typically centered at 393.4nm;  and the prominences really only pop out at 393.38nm.       The K-line core is 393.37nm,        and your filter is very close to the desired performance.

  Calcium.     Vs    H-alpha

Thanks, appreciated. Nice to know.

[JeremyS]

Very nice @Nigella Bryant👍🏻

[Nigella Bryant]

3 minutes ago, JeremyS said:

Very nice @Nigella Bryant👍🏻

Thanks Jeremy, appreciated.

[Davey-T]

Nice Ca-K images Nigella, having had lots of hassle with Quark Chromo filters I've resisted the urge to invest in any of the others that they make.

Too much cloud, wind , snow here today.

Dave

[Nigella Bryant]

17 minutes ago, Davey-T said:

Nice Ca-K images Nigella, having had lots of hassle with Quark Chromo filters I've resisted the urge to invest in any of the others that they make.

Too much cloud, wind , snow here today.

Dave

Thanks Dave, I was nervous about buying it but first light showed me I was lucky. I've been very fortunate with my solar equipment.