Solar activity increased to high levels. Region 9415 (S22W07) produced an M7/2B flare at 09/1534 UTC associated with a 1600 SFU Tenflare, Type II and IV radio sweeps, and a full-halo CME. Region 9415 remained a large, magnetically complex group with a strong, persistent magnetic delta configuration within the large leader spot. The remaining regions were simply-structured and showed no significant changes. New Region 9425 (S25W26) was numbered.

Solar activity is expected to be at moderate to high levels. Region 9415 could produce another major flare during the period.

Geomagnetic field activity ranged from quiet to minor storm levels as CME effects gradually subsided. The greater than 10 MeV proton flux began to rise after today's major flare and was gradually increasing as the period ended. A greater than 100 MeV proton flux enhancement also followed the flare, but did not reach event levels.

Geomagnetic field activity is expected to decrease to quiet to unsettled levels on 10 April. The CME associated with today's flare is expected to reach Earth during the early hours of 11 April. Active to major storm levels will be possible during 11 - 12 April as the CME passes Earth. The greater than 10 MeV proton flux may increase to event levels early on 10 April.

  觀測的       09 Apr 165
  預測的   10 Apr-12 Apr  165/160/160
  90天平均值        09 Apr 167

  觀測的 Afr/Ap 08 Apr  033/041
  估算值     Afr/Ap 09 Apr  018/025
  預測的    Afr/Ap 10 Apr-12 Apr  012/015-030/035-025/025