Solar activity continues at very low levels. Region 621 (S14W01) contains minor magnetic mixing, but produced only small B-class activity. This period was actually highlighted by a number of CMEs, predominately off the west limb. The first of these occurred at around 02/2300Z from behind the northwest limb. An associated Type II radio sweep was observed with a shock speed of 658 km/s. Bright surging was observed on the west limb at 0830Z, which preceded another CME observed on LASCO imagery at 0950Z. The most impressive event of the period was a partial halo CME associated with a prominence eruption that began at around 03/1620Z. A Type II radio sweep (717 km/s) accompanied this CME. Much of the ejecta associated with this CME appeared to originate from behind the northwest limb.

Solar activity is expected to be very low to low. Very low levels are expected through 4 June. C-class activity is possible on 5 and 6 June with the return of old active regions.

The geomagnetic field was quiet to unsettled. Solar wind speed remains elevated near 500 km/s, but IMF Bz was predominantly northward. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.

The geomagnetic field is expected to continue at quiet to unsettled levels. There is a chance for isolated active periods at high latitudes through 4 June. The current weak coronal hole high speed stream is expected to subside by 5 June.

  觀測的       03 Jun 090
  預測的   04 Jun-06 Jun  090/095/095
  90天平均值        03 Jun 104

  觀測的 Afr/Ap 02 Jun  009/011
  估算值     Afr/Ap 03 Jun  009/012
  預測的    Afr/Ap 04 Jun-06 Jun  008/010-005/008-005/008