Solar activity was at low levels. Region 1460 (N15W93) and Region 1465 (S18W39) both produced C1 x-ray events at 25/2242Z and 26/1723Z respectively. Both had associated CMEs but neither are expected to be geoeffective. Three consecutive CMEs appeared on LASCO/C2 imagery at 26/0924Z, 26/1148Z, and 26/1638Z. All three were around the west limb and are not expected to be geoeffective.

Solar activity is expected to remain low with a slight chance for M-class activity for the next three days (27 - 29 April).

The geomagnetic field started the period at minor storm levels, but fell to quiet levels and remained mostly quiet for the remainder of the period. This activity was attributed to Coronal Hole High Speed Stream (CH HSS) effects. Solar wind speeds have steadily decreased from approximately 730 km/s to approximately 560 km/s. The Bz component of the interplanetary magnetic field has remained fairly neutral with minor fluctuations between +3 and -5 nT. Overall, the total field fluctuated between +2 and +8 nT. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels throughout the period.

The geomagnetic field is expected to be at quiet to unsettled levels with isolated active periods for day one (27 April) as CH HSS effects begin to wane. Days two and three (28 -29 April) are expected to be mostly quiet.

  觀測的       26 Apr 119
  預測的   27 Apr-29 Apr  115/110/105
  90天平均值        26 Apr 112

  觀測的 Afr/Ap 25 Apr  018/031
  估算值     Afr/Ap 26 Apr  013/017
  預測的    Afr/Ap 27 Apr-29 Apr  007/010-004/005-004/005