Solar activity was low. There were four C-class flares with three of these originating from the newly emerging Region 1440 (S26W24). The largest was a C2 flare that occurred at 1252Z. Region 1440 showed development throughout the day and appears to have a small magnetic delta configuration in the trailing portion of the group. There was a back-sided full halo CME from old Region 1429 that was observed in LASCO C2 imagery beginning at 21/0736Z. This CME is not expected to be geoeffective.

Solar activity is expected to be low with an slight chance for an isolated M-flare from Region 1440.

The geomagnetic field has been quiet. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels throughout the period.

The geomagnetic field is expected to be mostly quiet for the next three days (22-24 March).

  觀測的       21 Mar 100
  預測的   22 Mar-24 Mar  095/090/090
  90天平均值        21 Mar 122

  觀測的 Afr/Ap 20 Mar  004/005
  估算值     Afr/Ap 21 Mar  003/004
  預測的    Afr/Ap 22 Mar-24 Mar  007/007-006/005-006/005