Solar activity was moderate. Two impulsive M-class events occurred during the period. The first was an M1/1n flare from Region 9973 (S17E23) at 01/0357 UTC. This event was accompanied by a moderate tenflare (260 sfu), and Type II/IV radio sweeps (with estimated sweep velocity = 493 km/s). Region 9973 retains its large size and moderate magnetic complexity though also appears relatively stable. Today's second event was an M1/Sf flare from Region 9979 (S30E63), which occurred at 01/1049 UTC. This region is exhibiting moderate magnetic complexity as it rotates into better view on the visible disk. Newly numbered Region 9980 (S29E08) emerged on the disk today as a small and simply structured spot group.

Solar activity is expected to persist at low to moderate levels for the next three days. A chance for an isolated major flare exists for Regions 9973 and 9979.

The geomagnetic field was predominantly quiet, with some isolated unsettled periods.

The geomagnetic field is expected to remain mainly quiet to unsettled for most of the forecast period. There is a chance for isolated active conditions by the end of the period, which may result from the solar activity reported yesterday or from today's M1/1n event (described in section 1A above).

  Observed       01 Jun 179
  Predicted   02 Jun-04 Jun  175/170/170
  90 Day Mean        01 Jun 183

  Observed Afr/Ap 31 May  006/006
  Estimated     Afr/Ap 01 Jun  006/006
  Predicted    Afr/Ap 02 Jun-04 Jun  005/008-008/010-010/010