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Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Carole on Oct 16, 2011, 01:27:09

Title: The Sun - Kelling 23-9-11
Post by: Carole on Oct 16, 2011, 01:27:09
Finally got around to processing the last of my Kelling images
This was taken with my modified Canon DSLR single shot.
This is 3 days before the aurora, so I am suspecting the large sunspots on the left might have been responsible.

(http://gallery.orpington-astronomy.org.uk/albums/userpics/10047/normal_Sun_Kelling_23-9-11_DSLR.jpg)

Taken the same day with my webcam SPC900
(http://gallery.orpington-astronomy.org.uk/albums/userpics/10047/Kelling_23-9-11_with_webcam.jpg)
Title: Re: The Sun - Kelling 23-9-11
Post by: MarkS on Oct 16, 2011, 09:05:34

Looking good!
Title: Re: The Sun - Kelling 23-9-11
Post by: Carole on Oct 16, 2011, 09:25:05
Thanks Mark.  Although webcam seems to be the recommended choice for solar imaging, I do seem to be getting better results with the DSLR albeit a smaller object. 

Carole
Title: Re: The Sun - Kelling 23-9-11
Post by: PhilB on Oct 16, 2011, 11:13:19
Very nice, Carole, although the in one taken with the Canon the focus seems a little soft. Lots of nice detail in the second webcam image.
Title: Re: The Sun - Kelling 23-9-11
Post by: Carole on Oct 16, 2011, 14:35:32
Quotethe in one taken with the Canon the focus seems a little soft.
Duh, just remembered I can stack my DSLR RAW subs in Registax, I was just thinking I couldn't in DSS as there are no stars to align to.  Will do a stack, I think I took about 5, hopefully that will be a bit sharper.

Carole
Title: Re: The Sun - Kelling 23-9-11
Post by: Carole on Oct 16, 2011, 15:21:40
Stack of 5 with DSLR.
(http://www.caroleastronomy.webspace.virginmedia.com/_wp_generated/wpf2072b50_0f.jpg)

Close up of the Sunspots on the left:
(http://www.caroleastronomy.webspace.virginmedia.com/_wp_generated/wpda380f3e.jpg)
Title: Re: The Sun - Kelling 23-9-11
Post by: MarkS on Oct 16, 2011, 17:50:59

The stack comes out very nicely - it was well worth doing.

Mark
Title: Re: The Sun - Kelling 23-9-11
Post by: Carole on Oct 16, 2011, 18:50:45
Thanks Mark, glad I remembered I could stack, though Registax found it hard work and took ages to go through each procedure.

Carole
Title: Re: The Sun - Kelling 23-9-11
Post by: RobertM on Oct 16, 2011, 18:57:27
Those are very nice Carole.
Title: Re: The Sun - Kelling 23-9-11
Post by: Carole on Oct 16, 2011, 19:11:05
Thanks Robert.  

I was keen to process this one because of the aurora.  I looked around on a number of sites to see if any-one had imaged the Sun on the actual day (26th), and although some did, they were not full frame so you couldn't see where the sunspots were located.  

I've now done some surfing and it was indeed this sunspot AR1302 (bigger than Earth and one of the largest on record) that caused the aurora having produced two previous solar flares before turning towards Earth.  
on 24-9-11 the sunspot produced an X1.9 class solar flare (the 2nd flare of several).

Carole
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