Solar activity was at high levels. Region 365 (S07W45) once again produced a major flare early in the period. An X1.1/2b event occurred at 29/0105Z that had an associated Tenflare, Type IV and Type II (estimated shock velocity of 1170 km/s.) radio sweeps. SOHO/LASCO imagery depicts a very symmetric full halo CME resulting from the event. This region remains extremely complex (a beta-gamma-delta structure) although the penumbral coverage has shown little growth during the period. Region 368 (S32W15) also managed to produce a notable flare today, an M1.5/1f event occurred at 29/0217Z. This region did show some magnetic growth during the period. No new regions were numbered today.

Solar activity is expected to be at moderate to high levels. Region 365 continues to show the potential to produce major flare activity.

The geomagnetic field was at unsettled to severe storm levels. A recurrent coronal hole was responsible for the initial elevated conditions. At approximately 29/1155Z the first of two transients associated with the first two X-class flares from late on the 27th and early on the 28th passed the NASA/ACE space craft. The second occurred at approximately 29/1830Z and was responsible for the severe storm conditions seen late in the period. The greater than 10 MeV proton fluxes at geosynchronous orbit achieved event levels at 28/2335Z and reached a maximum of 121 pfu at 29/1530Z. The greater than 2 MeV electron fluxes at geosynchronous orbit reached high levels today.

The geomagnetic field is expected to be at predominantly active to major storm levels with severe storm condition anticipated. Another transient passage is expected between 30/0600 and 1200Z on day one of the period. The greater than 10 MeV proton fluxes should remain above threshold levels through day one of the interval.

  觀測的       29 May 138
  預測的   30 May-01 Jun  145/140/135
  90天平均值        29 May 125

  觀測的 Afr/Ap 28 May  022/036
  估算值     Afr/Ap 29 May  050/060
  預測的    Afr/Ap 30 May-01 Jun  050/060-025/040-015/025