1st SHG and proms of the day June 1st 2023

[ChrisHalpha2017]

Hello,
today i've decided to go a go at iNTI from Christian BUIL with SolEx.
So I tried iNTI with my spectro-coronagraph... Here are the first results that for once looks like the current sun

Also the nice prominence of the day with the spectro coro

_2023-06-01-1329_8-CI-G-Sun_Halpha_diskHC BEST réduit.jpg (398.68 KiB) Viewed 892 times

_2023-06-01-1329_8-CI-G-Sun_Halpha_protus BEST réduit.jpg (463.33 KiB) Viewed 892 times

600 lines/mm

tiff 600 19+++++besrt_20230601_140616.519_UT reduit.jpg (426.4 KiB) Viewed 892 times

1200 lines /mm

1200 tmm réduit.jpg (391.21 KiB) Viewed 892 times

1800 lines/mm

1800 tmm 2.jpg (479.69 KiB) Viewed 892 times

and 2400 lines /mm : the doppler effect show the spicules and the velocity of the different parts of the prominences.

Here it can be clearly seen that a part of these prominences is arching over the chromosphere . The 2400 lines gives (in this case more information about the little prominence on the left )

2400 tmm 2++.jpg (368.63 KiB) Viewed 892 times

2400 tmm.jpg (410.43 KiB) Viewed 892 times

Chris

[rsfoto]

Hi Chris,

Excellent. Do you have different disc sizes or do you move the disc in and out according to the Sun size.

Where is the disc exactly placed ?

[ChrisHalpha2017]

Hi rsfoto

I have different sizes but as there is no motor its best not to use a disk that matches the sun perfectly : otherwize keeping the sun hidden becomes very hard as it will have to be more precise (wich is almost impossible by hand).

"Where is the disc excatly" : have a guess.... everything was explained in the link I posted about the making of a spectro-coronagraph. It's also the same of every spectroscope.

https://adsabs.harvard.edu/full/1985LAstr..99..295C

[Montana]

Great to see you tinkering to get a full disc

Alexandra