Solar activity has been at very low levels for the past 24 hours. A 10 degree filament, centered near N08E20, was observed erupting in H-alpha imagery beginning at 27/1939 UTC. STEREO-A COR2 imagery showed an associated faint CME beginning at 27/2309 UTC with the majority of the ejecta directed north of the ecliptic. We are currently waiting on further imagery to determine possible geoeffectiveness. There are currently 4 numbered sunspot regions on the disk.

Solar activity is likely to be low with a slight chance for an M-class flare on days one, two, and three (29 Dec, 30 Dec, 31 Dec).

The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed, as measured by the ACE spacecraft, reached a peak speed of 314 km/s at 28/0506Z. Total IMF reached 6.2 nT at 28/1254Z. The maximum southward component of Bz reached -5.3 nT at 28/1804Z.

The geomagnetic field is expected to be at quiet levels for the next three days (29 Dec, 30 Dec, 31 Dec).

  觀測的       28 Dec 106
  預測的   29 Dec-31 Dec 105/105/100
  90天平均值        28 Dec 118

  觀測的 Afr/Ap 27 Dec  000/000
  估算值     Afr/Ap 28 Dec  001/002
  預測的    Afr/Ap 29 Dec-31 Dec  006/005-005/005-005/005