Solar activity was at low levels. Region 226 (S28W28) produced multiple low level C-class flares. The largest optically correlated event was a C2.7/Sf flare that occurred at 19/0035 UTC. Magnetic analysis of this region depicts a complex delta structure continuing in the intermediate cluster of penumbral spots. Region 229 (N19W03) was quiescent through the period. White-light analysis shows decay in areal coverage as a weak gamma magnetic structure remains evident in the central portion of this region's spot complex. Region 230 (S08E32) has continued to grow and now has a weak gamma magnetic structure seen in the trailing portion of the region. This region was also responsible for minor C-class flare activity early in the period. New Region 231 (S25E13) was assigned today.

Solar activity is expected to be at moderate levels. Regions 226, 229, and 230 all are capable of producing M-class flares. There is a slight chance of a major flare occurring in Region 226.

The geomagnetic field was at unsettled to minor storm levels. A favorably positioned recurrent coronal hole and the resulting high speed stream are responsible for the elevated conditions.

The geomagnetic field is expected to be at unsettled to minor storm levels through day one of the forecast period, becoming predominantly unsettled to active levels on day two and returning to quiet to unsettled conditions by day three.

  Observé       19 Dec 193
  Prévisionnel   20 Dec-22 Dec  195/195/185
  Moyenne des 90 derniers jours        19 Dec 166

  Observé Afr/Ap 18 Dec  002/006
  Estimé     Afr/Ap 19 Dec  020/025
  Prévisionnel    Afr/Ap 20 Dec-22 Dec  015/020-010/012-008/010