2687 2688
2687
Alpha
64
64
  • Area = 1
  • Zurich = B
  • Penumbra = no penumbra (Zurich class A or B)
  • Leading = 1
  • NN = 2

Catania sunspot groups
2017-11-20 08:30:00
NOAA AR/sunspot
NOAA Halpha plage
NOAA expected region
2017-11-19 00:30:00
PROBA2/SWAP 17.4nm
2017-11-22T04:44:36.524