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Full disk H-alpha on 20th June 2021

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#1 cmas

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Posted 20 June 2021 - 05:22 AM

Still following the active region. Today there's also pretty nice protuberances. Most likely animation-worthy action!

 

51259884380_f48a8af644.jpg


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#2 rigel123

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Posted 20 June 2021 - 05:31 AM

Another nice disk!


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#3 cmas

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Posted 20 June 2021 - 05:33 AM

Thanks Warren! Unfortunately here we seemed to have some slight cloudiness / overcast going on and that shows in the image quality. Couldn't help myself however as these (almost) clear skies are not gonna last forever.



#4 rigel123

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Posted 20 June 2021 - 05:35 AM

Thanks Warren! Unfortunately here we seemed to have some slight cloudiness / overcast going on and that shows in the image quality. Couldn't help myself however as these (almost) clear skies are not gonna last forever.

I hear you!  I have my share of “through the clouds” shots!


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#5 ChrisWhite

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Posted 20 June 2021 - 06:28 AM

I'm not a solar imager (i've dabbled with it but nothing serious) and I wonder why there is a black ring around the perimeter of the sun below the flaring?  Pretty cool image!  Nice work!


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#6 cmas

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Posted 20 June 2021 - 06:58 AM

Chris: It arises from post processing. I don't image the disk and protuberances separately. This means I have to dig the protus and surface detail out from the same raw data. I do this by adjusting tone curve / histogram in ImPPG. This basically means that in order to bring out the protuberances my histogram curve is not linear or a typical "S-curve". I would describe my settings to look like a "double peak" i.e. I make one "hump" close to blacks to pop out the protus and then bring the curve down and continue with a more traditional S-curve. Thus one could say that the image is partially inverted.
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#7 PhotonJohn

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Posted 20 June 2021 - 11:35 AM

Very nice cmas.


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