may 16th ; the huge prom is till there :)

I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
Post Reply
ChrisHalpha2017
Ohhhhhh My!
Ohhhhhh My!
Posts: 173
Joined: Mon May 02, 2022 1:19 pm
Has thanked: 259 times
Been thanked: 237 times

may 16th ; the huge prom is till there :)

Post by ChrisHalpha2017 »

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 :
1800 tmm littrow  avec FLAT  2++++++_20230516_062616.295_UT  traitée ++.jpg
1800 tmm littrow avec FLAT 2++++++_20230516_062616.295_UT traitée ++.jpg (323.39 KiB) Viewed 852 times
and depending on the grating it produces anamorphosis and curving of the image but the contrast gets better :
2400 tmm Littrow  fine  ++++  TRAITEE.jpg
2400 tmm Littrow fine ++++ TRAITEE.jpg (222.94 KiB) Viewed 852 times
In the afternoon I tried to get it better...
1800 tmm littrow  15h08 LT_20230516_130837.979_UT    traité annotée.jpg
1800 tmm littrow 15h08 LT_20230516_130837.979_UT traité annotée.jpg (514.81 KiB) Viewed 852 times
and then a photo montage from a .SER....
The prominence at the base appears very bright in comparison and the image is noisy.
MONTAGE.jpg
MONTAGE.jpg (333.94 KiB) Viewed 852 times
Chris


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
User avatar
Montana
Librarian
Librarian
Posts: 34559
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 17666 times
Been thanked: 8787 times

Re: may 16th ; the huge prom is till there :)

Post by Montana »

It's incredible that the SHG is picking this up and not the narrow band filters :hamster: Whereabouts on the Sun is this? and I will check the SDO images.

:hamster:

Alexandra


ChrisHalpha2017
Ohhhhhh My!
Ohhhhhh My!
Posts: 173
Joined: Mon May 02, 2022 1:19 pm
Has thanked: 259 times
Been thanked: 237 times

Re: may 16th ; the huge prom is till there :)

Post by ChrisHalpha2017 »

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) :
Sol del 13 de mayo del 2023-Stellarvue-Daystar-6az-pos   FAINT prominence.jpg
Sol del 13 de mayo del 2023-Stellarvue-Daystar-6az-pos FAINT prominence.jpg (1.01 MiB) Viewed 811 times

and this one its mine compared to GONG where its a very faint hint of the prom on the SHG .

20230513130742Ch  protu faible.jpg
20230513130742Ch protu faible.jpg (467.01 KiB) Viewed 811 times


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
ChrisHalpha2017
Ohhhhhh My!
Ohhhhhh My!
Posts: 173
Joined: Mon May 02, 2022 1:19 pm
Has thanked: 259 times
Been thanked: 237 times

Re: may 16th ; the huge prom is till there :)

Post by ChrisHalpha2017 »

so today there it was still there but not much of it...


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
Post Reply