Solar activity was at very low levels. The largest event of the period was a long duration B9 x-ray event at 22/2010Z from an area of enhanced emission located behind the east limb near S15. New Region 1577 (N08E43) emerged on the disk as a stable, 4-spot bipolar group. Region 1575 (N08E24) increased in magnetic complexity to a beta-gamma configuration. The remainder of the disk and limb was quiet and stable. No Earth-directed CMEs were observed.

Solar activity is expected to be at predominately low levels all three days of the forecast period (23 - 25 September). A slight chance for M-class activity exists for day three as active regions are expected to rotate onto the visible disk.

The geomagnetic field was at quiet levels. ACE satellite measurements indicated a steady decline in wind velocity from about 500 km/s to near 400 km/s while the Bz component of the interplanetary magnetic field did not vary much beyond +/- 4 nT.

The geomagnetic field is expected to be at predominately quiet levels all three days of the forecast period (23 - 25 September).

  觀測的       22 Sep 125
  預測的   23 Sep-25 Sep  125/125/130
  90天平均值        22 Sep 123

  觀測的 Afr/Ap 21 Sep  005/006
  估算值     Afr/Ap 22 Sep  004/004
  預測的    Afr/Ap 23 Sep-25 Sep  005/005-004/005-005/005