Solar activity increased to high levels today. Region 365 (S07W32) produced two X-class flares early in the period. The first was an X1.3/2b flare that occurred at 27/2307Z with an associated Tenflare (910 sfu), Type IV, and Type II (estimated shock velocity of 607 km/s.) radio sweep. The second, larger flare, an X3.6 x-ray event which occurred at 28/0027Z that also had an associated Tenflare (1600 sfu), Type IV, and Type II (estimated 392 km/s.) radio sweep. Both flares had associated CME's (based on LASCO imagery) that appear to be Earth directed. This region continues to show good growth and remains a beta-gamma-delta magnetic complex. Little activity was noted from the rest of the disk. Region 374 (S22W59) was newly assigned today.

Solar activity is expected to be at moderate to high levels. Region 365 is very capable of producing major flare activity.

The geomagnetic field was at active to major storm levels. A recurrent high speed stream coronal hole is responsible for the elevated levels. The greater than 10 MeV proton fluxes have been just under event threshold levels for the past several hours of this period. The greater than 2 MeV electron fluxes at geosynchronous orbit reached moderate levels today.

The geomagnetic field is expected to be at predominantly active to minor storm levels through the forecast period. Transient activity from today's X-flares is expected by day two of the interval with resulting major to severe storm conditions possible. The greater than 10 MeV proton fluxes at geosynchronous orbit may reach threshold levels on day one of the period.

  Observed       28 May 130
  Predicted   29 May-31 May  135/140/135
  90 Day Mean        28 May 125

  Observed Afr/Ap 27 May  018/026
  Estimated     Afr/Ap 28 May  025/038
  Predicted    Afr/Ap 29 May-31 May  025/025-040/050-015/025