Solar activity was moderate, due to the occurrence of an M-class event late in the period. Region 9979 (S30E50) produced an M1.1 x-ray flare, which peaked at 02/2044 UTC. The optical enhancement remained in progress at the end of the period, but preliminary reports suggest a 1f intensity. This event also produced a moderate tenflare (530 sfu) and a Type-II radio sweep (estimated velocity 1079 km/s). Several C-class events also occurred throughout the day: Region 9977 (S20W54) produced a C8/Sf event at 02/1015 UTC with associated Type-II (estimated velocity 323 km/s) and Type-IV radio sweeps. Region 9973 (S17E10) produced an impulsive C9/Sf at 02/1147 UTC. A long duration C3.2 x-ray enhancement peaked at 02/0050 UTC, but lacked correlating optical activity reports. Three new regions came into view on the east limb and were numbered today: 9981 (S22E70), 9982 (S03E74), and 9983 (N24E72).

Solar activity is expected to persist at low to moderate levels for the next three days. A small chance for an isolated major flare also exists for the period.

The geomagnetic field was at quite to active levels. A rising trend in solar wind speed and fluctuating IMF, in possible association with a weak coronal hole close to geoeffective longitudes on the sun, caused predominantly unsettled and isolated active periods throughout the day.

The geomagnetic field is expected to be at predominantly unsettled to active levels for the next two days. Some combined effects from the numerous solar events of the past 48 hours are anticipated during this period. Conditions are expected to be mainly unsettled by the end of the forecast period.

  Pozorováno       02 Jun 175
  Předpovězeno   03 Jun-05 Jun  170/170/165
  90 denní průměr        02 Jun 183

  Pozorováno Afr/Ap 01 Jun  005/008
  Odhadovaný     Afr/Ap 02 Jun  012/015
  Předpovězeno    Afr/Ap 03 Jun-05 Jun  015/015-020/020-012/015