Solar activity remained at low levels. Region 9876 (S15E18) produced a long-duration C5/Sf flare at 24/1754 UTC. This region showed a minor spot increase near its leader spots, but showed an overall decrease in area due to a decrease in penumbral coverage in its trailer spots. It remained moderately complex with mixed polarities within its trailer portion. Region 9881 (S03W34) showed minor spot growth and produced a C4/Sf flare at 24/2036 UTC. Spot growth was also observed in Region 9880 (N07W08), but it produced no optical flares. Region 9878 (N09E28) retained moderate magnetic complexity, but showed no significant changes.

Solar activity is expected to be at low to moderate levels. There's a fair chance for isolated, low-level M-class activity during the period.

Geomagnetic field activity increased to active to major storm levels during 24/0200 - 1200 UTC. Field activity decreased to active to minor storm levels during 24/1200 - 1800 UTC, then decreased to mostly unsettled levels for the rest of the period. The increase in activity coincided with a period of sustained southward IMF Bz (maximum southerly deflections to minus 12 nT (GSM), as measured by NASA's ACE spacecraft). The greater than 10 MeV proton event that began at 22/2020 UTC ended at 23/2030 UTC. The peak flux for this event was 16 pfu at 23/1320 UTC.

Geomagnetic field activity is expected to be at unsettled to active levels on 25 March. Quiet to unsettled conditions are expected during the rest of the period.

  觀測的       24 Mar 175
  預測的   25 Mar-27 Mar  170/165/165
  90天平均值        24 Mar 210

  觀測的 Afr/Ap 23 Mar  008/009
  估算值     Afr/Ap 24 Mar  035/050
  預測的    Afr/Ap 25 Mar-27 Mar  015/020-010/010-010/010