2673
2680
Alpha
55
55
  • Area = 4
  • Zurich = J
  • Penumbra = small symmetric (s) north to south diameter < 2.5
  • Leading =
  • NN = 2

Catania sunspot groups
2017-09-20 08:48:00
NOAA AR/sunspot
NOAA Halpha plage
NOAA expected region
2017-09-20 00:30:00
PROBA2/SWAP 17.4nm
2017-09-20T19:45:32.536