Solar activity remained at moderate levels today. The largest flare of the period was an M1/Sf which occurred at 25/0540Z from Region 346 (N16E61) and had an associated Type II radio sweep with an estimated shock velocity of 814 km/s. There seems to be little magnetic complexity to this region based on a single Hsx spot seen in white-light. Region 337 (S14W13) appears to have changed little since yesterday and remains a beta-gamma magnetic complex. Region 338 (N18W58) produced the majority of the flare activity throughout the interval which was limited to C-class events. Magnetically, this region appears to be in a decay phase as a single delta complex remains apparent verses the several complexes analyzed earlier in the period. No new regions were numbered today.

Solar activity is expected to be at low to moderate levels. Region 338 remains capable of producing M-class events.

The geomagnetic field was at predominantly active to minor storm levels. High speed solar wind speeds along with embedded transient activity are believed to be responsible for the elevated conditions. The greater than 2 MeV electron fluxes at geosynchronous orbit reached high levels again today.

The geomagnetic field is expected to be at active to minor storm levels with isolated major storm conditions possible throughout the period. High speed coronal hole flow may continue to be enhanced by transient activity for the entire interval. A weak CME impact from the M5 flare on April 23 is possible on day one. Further CME effects are possible on day two resulting from the M3 flare that occurred on 24 April. The M1 that occurred today may have a very weak impact late on day two into day three.

  觀測的       25 Apr 144
  預測的   26 Apr-28 Apr  145/150/145
  90天平均值        25 Apr 126

  觀測的 Afr/Ap 24 Apr  024/024
  估算值     Afr/Ap 25 Apr  020/025
  預測的    Afr/Ap 26 Apr-28 Apr  020/025-020/025-015/020