Solar activity was low. Region 9373 (S07W20) generated several small C-class flares. The largest of these was a C5/SN at 16/1041 UTC. Region 9384 (N11W23) also produced a number of small C-class subflares. Both Regions exhibited flare-bright plage fluctuations throughout the day. A full halo CME was reported by the SOHO LASCO team as being first observed in the LASCO C2 instrument at 16/0350 UTC. Timing of the event suggests that it is most likely associated with an eruptive filament between Regions 9373 and 9384. Small C-class flares also occurred in these Regions during this time period.

Solar activity is expected to be low. Additional C-class flares are possible in Regions 9373 and 9384. Both Regions are also capable of a low-level M-class flare.

The geomagnetic field was quiet to unsettled.

The geomagnetic field is expected to be quiet to unsettled. Increased activity levels are possible at the end of the three-day forecast period in response to the CME discussed in Part IA.

  觀測的       16 Mar 140
  預測的   17 Mar-19 Mar  135/130/130
  90天平均值        16 Mar 161

  觀測的 Afr/Ap 15 Mar  002/003
  估算值     Afr/Ap 16 Mar  003/004
  預測的    Afr/Ap 17 Mar-19 Mar  005/005-015/015-015/020