As I explained here, I keep seeing >>smudges<< in oxygen O I 7772. Smudges, ie regions that are darker than expected based solely on the location of flares and plages, yet seem to be related to whatever is happening in extreme UV. Here’s this day’s smudge.
2026-03-21-1244 solar disk, oxygen divided by continuum (and some other math), showing a smudge
2026-03-21-1244 smudge marked
2026-03-21-1244, Fe I 7781, reconstruction, local constrast
2026-03-21-1244, Fe I 7781, reconstruction, global curved
2026-03-21-1244 O I 7772, reconstruction, global curved
continuum, ~7770, reconstruction, global curved
HMI reference
AIA 1700 reference
AIA 1600 ref
AIA 211 reference
AIA 335 ref
SUVI 284 ref
