Previously, as described in Smudges in Oxygen, O I 7772 I hinted at the fact that smudges in oxygen are usually accompanied by bright smoldering in EUV, and that the difference between AIA 1600 / AIA 1700 is a potentially good indicator of where to expect smudges.
In 2029-09-15, I collected data where a prominent smudge appears in oxygen, without anything outstanding in other wavelength. The smudge persisted for several hours, during which the area in question didn’t flare.
The smudge is the dark „spot” at around 9 o’clock, corresponding to a plage and filament in Ha.
202609150649 O I 7772 2026.09.15. dividaRot
20260915070705 sdo aia 0304 helioviewer
202609150649 O I 7772 2026.09.15. kontinuumDiskRot
202609150649 O I 7772 2026.09.15. oxyDio2Pow2Rot
202609150649 O I 7772 2026.09.15. oxygenDiskRot
202609150649 O I 7772 2026.09.15. deltaDiskMRot
20260915064238 sdo aia 1600 helioviewer
20260915064242Lh gong helioviewer
20260915065038 sub 1k6 1k7 helioviewer
20260915065342 goes suvi 0131 helioviewer
20260915065357 sdo aia 0171 helioviewer
20260915065409 sdo aia 0211 helioviewer
20260915065412 goes suvi 0195 helioviewer
20260915065632 goes suvi 0094 helioviewer
20260915070648 sdo aia 0335 helioviewer
