Solar activity was moderate. Region 105 (S08E42) produced the largest event of the period, an impulsive M2/1n flare with associated Type-II and Type-IV radio sweeps, however no significant CME was visible in LASCO imagery following the event. Numerous C-class flares also occurred, with many from Region 105 but also from Regions 107 (N11E43) and 103 (N15W21). Region 105 remains the largest and most complex region on the visible disk, while Regions 103 and 107 have both undergone rapid growth in size and complexity during the period. Three new regions were numbered today: 108 (S23E49), 109 (S08E18), and 110 (N20E18). All are presently small and simply structured.

Solar activity is expected to remain at moderate levels for the next three days. A chance for an isolated major flare event exists for Region 105.

The geomagnetic field ranged from quiet to minor storm conditions. Persistent southward Bz during most of the past 24 hours was responsible for the elevated periods of activity.

The geomagnetic field is expected to be quiet to active for the next 48-72 hours, as an equatorial extension of the south polar coronal hole rotates though geoeffective heliographic longitudes.

  觀測的       10 Sep 221
  預測的   11 Sep-13 Sep  220/225/225
  90天平均值        10 Sep 172

  觀測的 Afr/Ap 09 Sep  007/010
  估算值     Afr/Ap 10 Sep  013/018
  預測的    Afr/Ap 11 Sep-13 Sep  012/015-015/015-010/015