Hi
Here is a Ha image of the sun taken late today with a spectroheliograph.
That very large filament is still visible & prominent.
Seeing wasn't great with quite windy conditions at the time.
Only 4 frames stacked in AS3! here and deconvolved in Astrosurface.
As before, imaged through a Skywatcher ED100 @ f/9.
Optometrics 2400l/mm grating and ASI183MM pro camera.
Disc reconstructed using Doug Smith's SHG software.
ROI of 3120 x 150 pixels scanning at 300FPS.
Spectral sampling at 0.05A/pixel.
Slightly better res version here:
https://flic.kr/p/2pnJvMu
Cheers
Maurice
