Solar activity was low. Region 9742 (N10E13) produced several C-class events including a C8 flare at 20/0438Z. This region exhibited impressive flux emergence and spot growth this period, almost doubling in size and spot count. Most growth was concentrated in the trailer portions of the region, but mixed polarities were obvious throughout the spot group. Regions 9741 (N05W21) and 9747 (N12E58) produced occasional minor C-class flares. Moderately complex Regions 9733 (N12W88) and 9739 (S14W90) are rotating quietly around the west limb. A large prominence eruption and associated CME occurred on the SE limb between 19/2344 - 20/0028Z. New Regions 9748 (S11E36), and 9749 (S08E72) were numbered today.

Solar activity is expected to be at moderate levels. Region 9742 holds good potential for M-class activity and is developing potential for a major flare.

The geomagnetic field was quiet.

The geomagnetic field is expected to be quiet to unsettled. Periods of unsettled conditions are likely on days two and three as a large southern coronal hole moves into a geoeffectively favorable position.

  Observed       20 Dec 221
  Predicted   21 Dec-23 Dec  215/215/215
  90 Day Mean        20 Dec 218

  Observed Afr/Ap 19 Dec  005/009
  Estimated     Afr/Ap 20 Dec  005/006
  Predicted    Afr/Ap 21 Dec-23 Dec  008/008-008/008-010/008