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Thread: Sun Ha... Seeing/Transparency What a difference a day can make.

  1. #1
    Lowjiber's Avatar
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    Default Sun Ha... Seeing/Transparency What a difference a day can make.



    Ever notice how solar imagers are seemingly always whining about the Seeing or Transparency? Well, I decided stitch two images together to show just what we're talking about. The two images below were captured on Feb 14th & 15th at around 1100 hrs (same vertical angle).

    The one on the left was shot on a clear (no clouds) day that still had the Jet Stream over Vegas kicking and screaming due to a rather severe dust storm the day earlier. The sky was blue, but like a black sky at night verses a "sorta black sky", the blue was "sorta blue"... not dark blue.

    One day later, the Jet Stream had moved to its regular position northward from the Vegas valley and the suspended dust went along with it.

    While you can see the 24hr rotation, notice the differences in surface details and the much more delicate proms surrounding the limb.

    Yes, they are slightly different colors. However, that's me. You see, when we color images, each case is different and a lousy image simply can't handle the more aggressive coloring you see on the right image.

    I'm posting these larger than we normally do in the open forum to allow you to see the differences better than that enlarged thumbnail that we normally post in the open forum... we usually save those for the Solar Viewing & Imaging Group.

    Last edited by bladekeeper; 03-20-2017 at 11:36 PM. Reason: per OP request
    ghswen, wdm2012, TILLIBOBS and 6 others like this.
    John (Urban Astronomer) Apertura AD10 Dob; ES AR152 on Twilight II; XLT 150 Dob; XLT 120EQ; Lunt Solar 60 PT/B1200; ES AR102; SW Pro 100ED; 90mm Eq; SW 90mm Virtuso Mak; 2 Orion ST-80's; Quark-C; Cams: ASI174MM & ASI174MM-cooled

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    bladekeeper (03-20-2017),kingclinton (03-21-2017),TILLIBOBS (03-20-2017),wdm2012 (03-20-2017)

  3. #2
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    Default Re: Sun Ha... Seeing/Transparency What a difference a day can make.

    Wow! Huge difference there, John. Thanks for showing this comparison.
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    Default Re: Sun Ha... Seeing/Transparency What a difference a day can make.

    John -

    You could just go ahead and call that Feb 14 image "The best JLO131 ever sees from East Texas". Seriously, a great illustration of the impact of seeing conditions!
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    Default Re: Sun Ha... Seeing/Transparency What a difference a day can make.

    Superb work, John - very impressive!
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    Default Re: Sun Ha... Seeing/Transparency What a difference a day can make.

    An excellent comparison John, thanks.
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    Default Re: Sun Ha... Seeing/Transparency What a difference a day can make.

    John
    Thank you very much for that comparison. My seeing 95% of the time is the left image, only a few times have I seen anything like the right image. I would kill for proms like the right image!

    And here I thought my usual poor images were my fault, rather it is the seeing here. We normally get the jet stream right over New England and have 3 different weather system that converge here.
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    Default Re: Sun Ha... Seeing/Transparency What a difference a day can make.

    A fantastic comparison John, thank you for taking the time to show it!
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    Default Re: Sun Ha... Seeing/Transparency What a difference a day can make.

    Wow! Both are nice images, but the one at right is downright CRISP!
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