Solar activity was low. Region 618 (S10E26) produced four low-level C-class events during the past 24 hours. The group continues to grow and is maintaining magnetic complexity with a delta configuration in the leader spots. New regions 619 (S09W37) and 620 (S15E34) emerged on the disk today as small sunspot groups.

Solar activity is expected to be low to moderate. There is a fair chance for an M-class event from Region 618, given the continuing growth trend and the magnetic complexity of the group.

The geomagnetic field was mostly unsettled during the past 24 hours. The high speed solar wind stream continues to persist (similar to the last 3-4 days) with speeds typically ranging from 450 to 500 km/s.

The geomagnetic field is expected to be quiet to unsettled for the next three days (24-26 May). The currently enhanced solar wind velocity is expected to decline to nominal levels over the next 24 hours. NOTE: The ACE spacecraft orbit will bring ACE nearly in line with the Sun from about May 30 to June 2, 2004. During that time solar radio noise is expected to interfere with spacecraft telemetry resulting in the loss of solar wind plasma, magnetic field, and particle data.

  觀測的       23 May 104
  預測的   24 May-26 May  105/105/100
  90天平均值        23 May 105

  觀測的 Afr/Ap 22 May  007/011
  估算值     Afr/Ap 23 May  010/010
  預測的    Afr/Ap 24 May-26 May  005/008-007/008-007/008