Solar activity was low. Region 9727 (S21W24) produced today's largest event, a C8/Sf at 0938 UTC. The region produced additional C-class subflares during the period. The group has shown an increase in area of about 35%. The growth primarily consisted of emerging positive polarity flux just north of the dominant negative leader spots. The merging of these opposite polarities across an east west inversion line has led to the formation of a strong delta configuration in the region. Region 9733 (N14E44) is the other region of note on the disk: the group has more clearly rotated into view with a beta-gamma magnetic configuration and produced a couple C-class subflares during the day. A seventeen degree filament near N39E24 disappeared sometime between 0116 UTC and 0545 UTC.

Solar activity is expected to be mostly moderate for the next three days. There is a small chance, however, for a major flare or a proton producing flare from Region 9727, especially if magnetic flux continues to emerge.

The geomagnetic field has been quiet during the past 24 hours.

The geomagnetic field is expected to be quiet to unsettled during the next three days.

  觀測的       10 Dec 219
  預測的   11 Dec-13 Dec  215/215/210
  90天平均值        10 Dec 219

  觀測的 Afr/Ap 09 Dec  001/003
  估算值     Afr/Ap 10 Dec  005/006
  預測的    Afr/Ap 11 Dec-13 Dec  010/008-007/008-007/008