Solar activity was very low. Region 424 (S18W28) maintains moderate size and complexity, but activity this period was limited to occasional intensity fluctuations in the plage field. New Region 431 (S12E68) was numbered today. This new region is likely the return of old Region 410 which produced multiple C-class flares during its last transit across the visible disk. A considerable degree of surging was observed, but limb proximity is still making it too difficult to assess this region's true complexity. Nothing remarkable in the remaining active regions.

Solar activity is expected to be at low levels. Regions 424 and 431 both have potential for C-class activity. There is a slight chance for an M-class flare.

The geomagnetic field was unsettled to active. The high speed solar wind stream is subsiding as the large equatorial coronal hole rotates out of a geoeffective position. Wind speed began the period near 750 km/s, but has gradually declined to near 650 km/s. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels.

The geomagnetic field is expected to range from quiet to major storm levels. Predominantly quiet to unsettled levels with occasional active periods are expected on days one and two as the current high speed solar wind stream continues to weaken. Another recurrent equatorial coronal hole will move into a geoeffective position by day three and produce occasional minor to major storm periods.

  觀測的       09 Aug 130
  預測的   10 Aug-12 Aug  135/135/135
  90天平均值        09 Aug 125

  觀測的 Afr/Ap 08 Aug  022/032
  估算值     Afr/Ap 09 Aug  015/016
  預測的    Afr/Ap 10 Aug-12 Aug  015/015-015/020-025/035