Solar activity has been at moderate levels for the past 24 hour. Region 1387 (S22W42) has produced two M-class flares, the largest being an M2/Sf event at 26/2030Z. Region 1387 continues to grow, in areal coverage and magnetic complexity as it rotates into a more geoeffective location. Region 1386 (S17E37) also continues to grow and evolve. A proton enhancement at geosynchronous orbit was observed by the GOES 13 spacecraft, with a max flux of 3 pfu at 26/0135. This enhancement appears to be correlated to the M4/1n flare from Region 1387 on 25 December. Protons were again at background level at the time of this report. Over the past 36 hours, 5 CMEs have been observed in STEREO and LASCO C2 and C3 imagery. Three CMEs were associated with eruptive filaments and two were associated with flares from Region 1387. Of these five CMEs two are forecast to become geoeffective.

Solar activity is expected to be at moderate levels with a slight chance for X-class events for the next three days (27 - 29 December).

The geomagnetic field has been at quiet levels for the past 24 hours.

The geomagnetic field is expected to remain at predominantly quiet levels on day one (27 December). An increase to quiet to active levels with a chance for an isolated minor storm period on days two and three (28 -29 December) is expected as two CMEs, from filament eruptions on 25 December and 26 December, are expected to arrive on 28 December and early on 29 December, respectfully.

  Pozorováno       26 Dec 146
  Předpovězeno   27 Dec-29 Dec  150/150/145
  90 denní průměr        26 Dec 144

  Pozorováno Afr/Ap 25 Dec  003/002
  Odhadovaný     Afr/Ap 26 Dec  001/001
  Předpovězeno    Afr/Ap 27 Dec-29 Dec  004/005-013/018-015/018