Solar activity increased to moderate levels. Region 9506 (N17E34) produced an M2/2n parallel-ribbon flare at 28/2021 UTC associated with minor centimetric radio bursts. It also produced a long-duration C1/Sf flare at 18/0230 UTC. Region 9506 showed signs of penumbral decay in its leader spot and maintained a mixed polarity structure. Region 9503 (N14E07) produced isolated subflares including a C4/Sf at 18/1455 UTC. This region also possessed a mixed polarity structure and showed no significant changes during the period. Region 9502 (S26W08), which produced isolated major flares on 13 and 15 June, gradually decayed and possessed a simple bipolar structure. Today's noon 10.7 cm flux reading of 221 SFU was flare enhanced. The morning reading of 199 SFU was more reflective of prevailing conditions.

Solar activity is expected to be at low to moderate levels. Regions 9503 and 9506 could produce isolated M-class flares.

Geomagnetic field activity ranged from quiet to minor storm levels with brief major storm periods detected at high latitudes. This disturbance was due to a CME passage at Earth that began around 18/0100 UTC.

Geomagnetic field activity is expected to be at quiet to active levels on the first day decreasing to quiet to unsettled levels for the rest of the period.

  Beobachtet       18 Jun 221
  Vorhergesagt   19 Jun-21 Jun  200/195/195
  90 Tage Mittel        18 Jun 173

  Beobachtet Afr/Ap 17 Jun  005/009
  Geschätzt     Afr/Ap 18 Jun  027/029
  Vorhergesagt    Afr/Ap 19 Jun-21 Jun  012/015-008/012-007/010