Solar activity was low. The largest flare this period was a C5/Sf from Region 528 (N09E23). This region was responsible for several other smaller C-class flares. Mixed polarities are obvious in the central and trailing portions of this spot group, where most of the activity is occurring. Isolated low C-class flares also occurred in Region 530 (S21E50). Region 525 (N08W10) continues to exhibit some mixed polarities, but remains relatively quiet. New Region 531 (N01W21) was numbered today.

Solar activity is expected to be low. There is a small chance for an M-class flare from Regions 525 and 528.

The geomagnetic field was unsettled to active. Solar wind speed remains elevated, ranging 600 - 650 km/s since late on 21 December. This high speed stream is associated with a well positioned transequatorial coronal hole. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels for a brief period today.

The geomagnetic field is expected to be quiet to unsettled with isolated active levels through 23 December. The high speed coronal hole stream that is creating this disturbance should begin to subside on the 23rd. Mostly quiet to unsettled levels are expected on 24 - 25 December.

  觀測的       22 Dec 138
  預測的   23 Dec-25 Dec  140/140/135
  90天平均值        22 Dec 136

  觀測的 Afr/Ap 21 Dec  018/021
  估算值     Afr/Ap 22 Dec  015/016
  預測的    Afr/Ap 23 Dec-25 Dec  012/015-005/010-005/010