Solar activity has been high. Region 486 (S16E57) produced several flares, including a M7.6/1n at 24/0254 UTC, with an associated Type IV radio sweep. An associated CME was observed on SOHO/LASCO imagery with an estimated velocity of 900 km/s, although the CME did not appear to be earth-directed. Region 484 (N05W15) produced an M1.3 at 24/1856 UTC. Region 484 appears to be decaying slightly, while Region 486 is growing. Both regions continue to exhibit large, complex beta-gamma-delta magnetic configurations. The F10 value is flare enhanced and is estimated due to solar activity at the time of the measurement.

Solar activity is expected to be high. Regions 484 and 486 are expected to produce major flares.

The geomagnetic field has been at quiet to severe storm levels. An interplanetary shock was observed at ACE at 24/1450 UTC, with a subsequent sudden impulse observed at 1530 UTC. The sudden impulse was followed by about two hours of severe geomagnetic storm activity, and produced a magnetopause crossing at GOES 12. Solar wind data show high density flow with strong magnetic fields (about 30 nT), although so far Bz has been strongly northwards. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.

The geomagnetic field is expected to be at active to severe storm conditions for day one, due to persistence from the current transient-driven activity. Activity should subside to unsettled to minor storm levels on days two and three.

  觀測的       24 Oct 191
  預測的   25 Oct-27 Oct  190/195/200
  90天平均值        24 Oct 117

  觀測的 Afr/Ap 23 Oct  005/007
  估算值     Afr/Ap 24 Oct  035/040
  預測的    Afr/Ap 25 Oct-27 Oct  035/040-030/040-020/030