Hello,
Again this huge prominence was visible and seem to evolve slowly. I could see only 2 people who managed to catch it in photo. And the main reason I assume is that narrow band H alpha filters cant show it as the prominence is already too dim.
SHG cant show it either unless you raise the gain and exposure a lot with the risk of saturating the whole sun image. I tried to see it better or record it better with a very narrow entrance slit but as the prominence itself is already very dim the contrast isnt enhanced.
With the eye i could only see it properly with a moderate power eyepiece (25 to 16mm). If I use a more powerfull eyepiece I cant see it anymore.
SO I had to raise both gain and exposure and modulate the contrast to catch it the best I could.
This morning I could take a fery good image :
and depending on the grating it produces anamorphosis and curving of the image but the contrast gets better :
In the afternoon I tried to get it better...
and then a photo montage from a .SER....
The prominence at the base appears very bright in comparison and the image is noisy.
Chris
may 16th ; the huge prom is till there :)
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may 16th ; the huge prom is till there :)
spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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Re: may 16th ; the huge prom is till there :)
It's incredible that the SHG is picking this up and not the narrow band filters Whereabouts on the Sun is this? and I will check the SDO images.
Alexandra
Alexandra
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Re: may 16th ; the huge prom is till there :)
actually even the SHG cant pick it up (none of the SHG photo showed it!!) and its because in order to see it the gain and exposure had to be pushed very high and then all the details of the other prominences and the details of the sun's disk are drowned in a luminous halo of overexposed light...
So its no wonder. And H alpha filters already dim the prominences briliance unless the bandwidth is o.8 or more A...
The first day I noticed it was the may 13th :
here is one of the only 2 photos from solar chat that show it!!
(this one is from a guy on FB solar chat) :
and this one its mine compared to GONG where its a very faint hint of the prom on the SHG .
So its no wonder. And H alpha filters already dim the prominences briliance unless the bandwidth is o.8 or more A...
The first day I noticed it was the may 13th :
here is one of the only 2 photos from solar chat that show it!!
(this one is from a guy on FB solar chat) :
and this one its mine compared to GONG where its a very faint hint of the prom on the SHG .
spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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Re: may 16th ; the huge prom is till there :)
so today there it was still there but not much of it...
spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM