Solar activity was very low. Region 588 (S15W38) contains the only sunspots on the visible disk. This region maintains a reverse polarity beta magnetic configuration, but has been quiet since producing a C2 flare and CME at 09/2040Z. No other significant activity or changes were observed.

Solar activity is expected to be low to very low. Isolated C-class flares are possible from Region 588.

The geomagnetic field was quiet to unsettled. Solar wind speed was in gradual decline following yesterday's CME impact. Speed declined from a peak near 570 km/s at 09/0505Z to near 400 km/s late in the period. A sharp discontinuity in solar wind plasma and IMF measurements occurred at 10/1925Z. This was likely the interplanetary shock associated with the C7 flare and CME on 08 April. Solar wind speed following the shock ranged from 500 to 540 km/s, but the IMF BZ was mostly northward. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels again this period.

The geomagnetic field is expected to be quiet to active. Occasional active periods are expected on 11 April following today's CME arrival. Updated LASCO imagery reveal another Earth-directed CME associated with yesterday's C2 flare at 09/2040Z. A geomagnetic response is likely on 12 April, but the disturbance should be limited to occasional active periods. Mostly quiet to unsettled conditions are expected on 13 April.

  觀測的       10 Apr 088
  預測的   11 Apr-13 Apr  090/095/100
  90天平均值        10 Apr 109

  觀測的 Afr/Ap 09 Apr  011/016
  估算值     Afr/Ap 10 Apr  015/012
  預測的    Afr/Ap 11 Apr-13 Apr  020/020-010/015-005/010