Solar activity was high. Region 9632 (S19E19) produced an X2/2b flare at 1038 UTC. Significant discrete frequency radio bursts (i.e., 7500 sfu at 2695 MHz) accompanied the event, as well as a Type IV sweep which lasted for many hours. A full halo coronal mass ejection was seen by SOHO/LASCO. This region remains bright in H-alpha and still shows mixed polarities in its largest spot. Elsewhere on the disk occasional small flares occurred from a number of the 15 spotted regions visible. Two new regions were assigned, Region 9636 (N12E65) and Region 9637 (S14E71).

Solar activity is expected to be moderate to high. Region 9632 is still a threat to produce additional M and X class activity.

The geomagnetic field was quiet to unsettled. Satellite proton events at greater than 10 and greater than 100 MeV began shortly after the X2/2b flare. The greater than 10 MeV protons crossed threshold at 1215 UTC, and reached a tentative maximum of 1,020 pfu at 2040 UTC. The greater than 100 MeV event began at 1440 UTC and attained its tentative maximum of 10.6 pfu at 2020 UTC. Neither trace is declining at this writing. In addition a Polar Cap Absorption event began at 1315 UTC, and registered a peak value of 9.0 dB of absorption at 30 MHz at approximately 1935 UTC.

The geomagnetic field is expected to be at major to severe storm levels beginning early on 26 September. The cme/flare event of earlier today is expected to spawn a strong disturbance expected to persist for 48 hours. The proton events currently occurring are likely to continue for the next 24 hours. The Polar Cap Absorption is expected to continue throughout the day on 25 September.

  觀測的       24 Sep 279
  預測的   25 Sep-27 Sep  285/290/285
  90天平均值        24 Sep 168

  觀測的 Afr/Ap 23 Sep  018/027
  估算值     Afr/Ap 24 Sep  010/012
  預測的    Afr/Ap 25 Sep-27 Sep  015/020-080/100-040/040