I imaged the Sun in the neutral Helium line at 7065.2 Angstrom (706.52 nm), on 2025-07-20. The weather was unfavorable with passing clouds and varying seeing, so between 0911 and 1033 UT, a bit after local noon, I recorded and finally kept 19 scans.
I ran a few searches on the internet. Just like with the solar disk in Fe II 5018.45Å, with prominences and all, this may well be the first amateur spectroheliogram of the Sun in this wavelength, and probably the first ever to be processed to reveal these details.
It was a challenge to find this line, but among others, the flash spectrum came to my help.
I used a 80/540 refractor, an in-cone band pass 642 IR filter as the energy rejection filter, and the ML Astro SHG700, with the cooled 678MM camera. Image processing with JSolEx, my own scripts.
More data is needed to confirm this, but at a first glance, this line at 7065, just like the He I D3, appears to reflect features from the corona.
the flash spectrum
the chromosphere spans out
cromosphere and prominence
a tiny bit of a doppler
chromosphere and prom
photoshpere, chromosphere and prominence
the guide line (line zero)
the chosen continuum
the He I 7065A line
prominences in the line
line – continuum, highlights some artefacts
after banding removal
the processed image
colorized
