Solar activity was at moderate levels. Region 39 (S15W44) produced an M1/Sb flare at 31/0153 UTC with associated discrete frequency radio burst. This region continues its gradual decay but maintains a delta configuration in the leader spot. Region 50 (S08W32) has shown growth in area and spot count while maintaining its beta-gamma magnetic configuration. Region 44 (S21W49) appears to have been relatively stable in the last 24 hours. New Region 56 (N04E49) was numbered today.

Solar activity is expected to be moderate. M-class activity is expected from Region 39, Region 44 or Region 50. An isolated X-class event is possible from Region 39.

The geomagnetic field was at quiet to unsettled levels. A weak shock was detected at the L1 position by the NASA/ACE spacecraft at approximately 31/1100 UTC. The Bz component of the IMF was northward resulting in little geomagnetic activity.

The geomagnetic field is expected to be quiet to unsettled. Isolated active conditions are possible on days one and two of the forecast period.

  觀測的       31 Jul 209
  預測的   01 Aug-03 Aug  205/200/200
  90天平均值        31 Jul 167

  觀測的 Afr/Ap 30 Jul  005/008
  估算值     Afr/Ap 31 Jul  009/012
  預測的    Afr/Ap 01 Aug-03 Aug  012/015-015/015-010/010