Stacking 12 scans, through continuum subtraction and further processing, I managed to reveal some really subtle details on the Sun, clearly showing filaments in Oxygen. Somewhat ironically, on this day, there were no flares, no smudges and no bright prominences, to add to the repertoire of the image presented here. I included AIA 1600, GONG and AIA/SUVI 304 for reference.

I consider it settled: there are filaments in oxygen, in O I 7772, on the disk of the Sun, and a Sol’Ex derivative amateur spectroheliograph can observe them.

07772-2026-09-01-0651 2-Sun-7772 2026.09.01. oxyDio2Pow2Rot pipp lapl2 ap18735 reg1 psG color

07772-2026-09-01-0651 2-Sun-7772 2026.09.01. oxyDio2Pow2Rot pipp lapl2 ap18735 reg1 psG mono

20260901064742Lh gong helioviewer

20260901065350 sdo aia 1600 helioviewer

20260901075653 sdo aia 0304 helioviewer