Re: Sun in Ha and Ca II K, September 9th '20

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Re: Sun in Ha and Ca II K, September 9th '20

Post by Carbon60 » Wed Sep 09, 2020 4:04 pm

A few from this morning in Ha and Ca II K.

First up is a full-disk on a DS Lunt 60 in mono and colour. Captured on a Basler acA1920-155um camera and 1.5x Barlow

Image20200909_Ha_FD_Mono by Stuart Green, on Flickr

Image20200909_Ha_FD_Colour by Stuart Green, on Flickr

Calcium K FDs captured on a 72mm f6 refractor using a Basler acA2440-75 camera, 1.5x Barlow and Lunt B600 Ca K module with omega/calcium K-line combo.

Image20200909_CaK_FD_Mono by Stuart Green, on Flickr

Image20200909_CaK_FD_Colour by Stuart Green, on Flickr

And some closer views on a Tecnosky 125 mm f7.8 refractor using a Basler acA2440-75 camera, 2.7x Barlow and Lunt B1800 Ca K module
with with and without additional filters (omega and Calcium K-line).

First without the additional filters:

Image20200909_CaK_x2.7_Mono_LuntB1800 by Stuart Green, on Flickr

Image20200909_CaK_x2.7_Colour_LuntB1800 by Stuart Green, on Flickr

and with..

Image20200909_CaK_x2.7_Mono_LuntB1800_Omega by Stuart Green, on Flickr

Image20200909_CaK_x2.7_Colour_LuntB1800_Omega by Stuart Green, on Flickr

Thanks for looking.

Stu.


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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by DeepSolar64 » Wed Sep 09, 2020 4:19 pm

Very nice images Stuart. The full disc CaK images show the plage in the south that contains new pores very well. The Ha images give me a good idea what is going on today. Thanks.


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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by EGRAY_OBSERVATORY » Wed Sep 09, 2020 4:42 pm

Same as James, so thanks Stuart.

Terry



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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by Montana » Thu Sep 10, 2020 7:02 am

Hmmm that baffles me Stuart, I can't understand why the Lunt filter on it's own the granulation cells are very large and flat disc shaped. Whereas with the Omega filter they suddenly become extremely small and dotty? I didn't think CaK was tiny dots, I thought it were photospheric like reverse granulation cells? Unless in the CaK on it's own you are seeing this, then by adding in the Omega filter you are actually seeing higher in the Chromosphere and seeing spicules instead of granulation cells?

Do you have any thoughts?
Alexandra



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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by JochenM » Thu Sep 10, 2020 8:08 am

A very quiet sun, but interesting captures nonetheless. I'd also be interested in trying to understand the point Alexandra raised.


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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by ffellah » Thu Sep 10, 2020 11:22 am

A beautiful series Stu. Those Ha disks are so evenly illuminated. Hoping that activity will pick up again soon before the sun starts to be lower on the horizon.

Franco



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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by Merlin66 » Fri Sep 11, 2020 12:52 am

Stu, sorry to high-jack the thread.....
Alexandra,
Interesting question...
My CaK DIY (three Omega filters + PST Cak "yellow") always seem to give "sharper" contrast features compared to others. I'm using the ASI 1600MM and sampling at 0.79 arcsec/pixel. My seeing is pretty average to bad.....
I use Firecapture, AS3! and a gentle tweak in ImPPG.
I always put it down to the effects of reducing the image to around 800 x 800 pixel (from 4656 x 3520) for suitable upload sizing.
The two attached images: one is a full frame JPEG from the full frame TIF (I can't seem to be able to upload an original TIF file???) and the other a reduced JPEG. (EDIT: Uploaded the original TIF file to dropbox: https://www.dropbox.com/s/pzkp539a8bjyf ... l.tif?dl=0 )
111932c_full.jpg
111932c_full.jpg (663.5 KiB) Viewed 218 times
111932c_jpeg.jpg
111932c_jpeg.jpg (30.48 KiB) Viewed 218 times
(What I should do is test the CaK DIY filter bandwidth on the spectrograph.......)


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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by Carbon60 » Fri Sep 11, 2020 5:24 am

No problem, Ken.

Many thanks everyone. I’m going to re-run with and without the additional filters multiple times to see if the effect is consistent as seeing and processing can significantly affect the look of the output image. This weekend looks promising weather wise.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by eroel » Fri Sep 11, 2020 2:07 pm

Stu:
A beautiful set of images.
Best wishes, hope that you will get nice weather, at my place it is daily clouded and rains.
Eric.



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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by marktownley » Sun Sep 13, 2020 3:57 pm

Nice images Stu. I've no time to get online at the moment, let alone do solar. Need life to drop down a gear...


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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by Carbon60 » Mon Sep 14, 2020 7:26 pm

Many thanks Eric and Mark.

Sounds like you’re really busy, Mark....back to school.

Stu.


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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by Merlin66 » Mon Sep 14, 2020 10:31 pm

Stu,
Did you get the chance to try the various filter combinations?
Ken


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Re: Re: Sun in Ha and Ca II K, September 9th '20

Post by Carbon60 » Tue Sep 15, 2020 5:42 am

Hi Ken,

Unfortunately not. The seeing conditions haven’t been suitable for a fair and accurate comparison. Okay for FDs, but nothing more. It is something I need to do when conditions allow.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/

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