Solar activity was moderate. Region 597, which has rotated beyond west limb at latitude S08, produced an M1 flare at 23/2112 UTC. The region produced numerous additional C-class flares through around 1400 UTC, but is now behind the limb. Newly numbered Region 599 (N14E51) emerged on the disk and grew steadily. The region had an area of 120 millionths with mature penumbra on the leader and trailer by the time of forecast issue (24/2200 UTC). The group has been producing frequent upper level B-class and lower level C-class flares. Region 596 (S09W21) continues to be the largest group on the disk but was stable and appears to be decaying.

Solar activity is expected to be low. Region 599 is expected to be the most productive group, although Region 596 might contribute some activity. There is a slight chance for an isolated M-class event sometime during the next three days.

The geomagnetic field was mostly quiet to unsettled. There was an isolated active period at high latitudes between 0900-1200 UTC. Solar wind speed remains slightly elevated with values running between 420 to 480 km/s.

The geomagnetic field is expected to be mostly unsettled with a chance for isolated active periods at high latitudes for the next 24 hours (25 April). Conditions should decline to mostly unsettled levels at all latitudes for the second and third days.

  觀測的       24 Apr 112
  預測的   25 Apr-27 Apr  115/115/120
  90天平均值        24 Apr 107

  觀測的 Afr/Ap 23 Apr  016/020
  估算值     Afr/Ap 24 Apr  010/013
  預測的    Afr/Ap 25 Apr-27 Apr  012/015-012/012-010/010