Solar activity remained at low levels. Minor growth occurred in Regions 9914 (N04E18), 9915 (N11E28), and 9916 (S18E47) and each produced an isolated subflare. Region 9912 (N11W38) showed gradual decay in its trailer spots. A large filament erupted from the southwest quadrant during 22/2230 - 2325 UTC. A CME followed the eruption, but it did not appear to be Earth-directed. New Regions 9920 (S23W03), 9921 (N12E41), and 9922 (N19E56) were numbered.

Solar activity is expected to be low to moderate. There's a chance for an isolated low-level M-class flare during the period.

Geomagnetic field activity ranged from quiet to major storm levels. Field activity increased to active to major storm levels during 23/0300 - 0900 UTC following a sudden impulse at 23/0450 UTC (60 nT, as measured by the Boulder USGS magnetometer). This increase was due to a CME passage associated with the X1 limb flare on 21 April from old Region 9906 (S16, L = 151). Activity decreased to unsettled to active levels during 23/0900 - 1800 UTC. The field was quiet after 23/1800 UTC. The greater than 100 MeV proton event that began at 21/0155 UTC ended at 22/2335 UTC (peak 22.9 pfu at 21/1025 UTC). The greater than 10 MeV proton event that began at 21/0225 UTC continued (peak 2520 pfu at 21/2320 UTC). The greater than 10 MeV flux at the close of the period was around 110 pfu.

The geomagnetic field is expected to be at unsettled to active levels on 24 April decreasing to quiet to unsettled levels for the rest of the period. The greater than 10 MeV proton event is expected to end on 25 April.

  Observé       23 Apr 175
  Prévisionnel   24 Apr-26 Apr  180/180/180
  Moyenne des 90 derniers jours        23 Apr 198

  Observé Afr/Ap 22 Apr  008/012
  Estimé     Afr/Ap 23 Apr  018/022
  Prévisionnel    Afr/Ap 24 Apr-26 Apr  015/015-010/010-008/008