Solar activity remained low. Region 9585 (N15E11) produced isolated subflares, none of which were associated with significant X-ray emission. New Region 9591 (S18E71) rotated into view. It was the likely source for a bright surge near SE19 at 21/1050 UTC. A filament erupted from the southwest quadrant around mid-period. The eruption was associated with a long-duration C2 X-ray event that peaked at 21/1303 UTC and a coronal mass ejection that did not appear to be Earth directed.

Solar activity is expected to be at low to moderate levels. There will be a fair chance for an isolated M-class flare during the period.

Geomagnetic field activity ranged from quiet to active levels. Activity increased to unsettled to active levels after 21/0900 UTC. The greater than 10 MeV proton flux remained slightly enhanced and gradually decreased toward background in the wake of the proton event of 16 - 18 August.

Geomagnetic field activity is expected to be at quiet to unsettled levels during most of the period.

  觀測的       21 Aug 160
  預測的   22 Aug-24 Aug  165/170/175
  90天平均值        21 Aug 152

  觀測的 Afr/Ap 20 Aug  006/010
  估算值     Afr/Ap 21 Aug  014/016
  預測的    Afr/Ap 22 Aug-24 Aug  012/010-010/010-012/012