Solar activity was at moderate levels. Region 9658 (S15W73) produced an M3/1f flare at 20/2325 UTC and associated discrete frequency radio bursts. Other activity was centered around Region's 9661 (N15W48) and 9670 (S19E19). Both of these regions produced minor C-class flares though the course of the period. Region 9661 was generally stable and has shown gradual decay as the magnetic delta configuration is no longer apparent in regions spot group. Two new regions were numbered today, Region 9675 (S14E69), and Region 9676 (N13E70).

Solar activity is expected to be at moderate to high levels. Region 9661 still remains capable of producing an M-class or isolated major flares.

The geomagnetic field was predominantly at quiet to unsettled levels. Brief active conditions were observed at both the middle and high latitudes in the 20/1200-1500 UTC period. The greater than 10 MeV proton flux at geosynchronous orbit passed the 10 pfu threshold at 19/2225 UTC, reached a maximum of 11 pfu at 19/2235 UTC. The short lived 10 MeV proton event ended at 19/2255 UTC though flux levels remained elevated at time of bulletin issue.

The geomagnetic field is expected to be at quiet to minor storm levels with the possibility of isolated major storm conditions late on day one and through day two of the period. Analysis of the full halo CME, on LASCO imagery (X1/2b flare at 19/0105 UTC from Region 9661), indicated shock arrival late on day one or early on day two. A second full halo CME (X1/2b flare at 19/1630 UTC from Region 9661) is expected to arrive late on day two of the period. The greater than 10 MeV proton flux levels from geosynchronous orbit could remain elevated through first day of the period.

  觀測的       20 Oct 245
  預測的   21 Oct-23 Oct  245/240/235
  90天平均值        20 Oct 190

  觀測的 Afr/Ap 19 Oct  006/008
  估算值     Afr/Ap 20 Oct  ???/???
  預測的    Afr/Ap 21 Oct-23 Oct  025/030-030/035-015/025