Solar activity remained at low levels. The largest event of the period was a C2/Sf from Region 9978 (S20E07) at 04/1614 UTC. SOHO-EIT imagery revealed an eruptive prominence off the southwest limb during 03/2200 - 04/0100 UTC, although no significant x-ray enhancement was observed in association with this event. New Region 9985 (N17E29) emerged on the visible disk and was numbered today, along with new Region 9986 (N03E72) which rotated into view from the east limb.

Solar activity is expected to be mainly low, with a chance for isolated M-class events, and an associated slight increase in proton flare probabilities as the larger active regions on the visible disk rotate through geoeffective heliographic longitudes during the next three days.

The geomagnetic field was quiet to active. Active periods corresponded primarily with sustained periods of southward IMF orientation.

Geomagnetic field activity is expected to be mainly unsettled for the first day of the forecast period, trending toward mostly quiet to unsettled conditions thereafter.

  觀測的       04 Jun 170
  預測的   05 Jun-07 Jun  165/165/170
  90天平均值        04 Jun 182

  觀測的 Afr/Ap 03 Jun  011/012
  估算值     Afr/Ap 04 Jun  016/015
  預測的    Afr/Ap 05 Jun-07 Jun  012/012-008/008-008/008