Solar activity was low. New Region 1226 (S18E74) produced a B-class event and four C-class events since being numbered today. The largest was a C5 observed at 27/1643Z. This region began with a B1 event at 26/1654Z as it approached the southeast limb yesterday. It is currently an H-type group, however, the region is still rotating onto the disk and more white light area are evident in the SDO/HMI imagery just visible on the limb. Region 1223 (S16W00) produced the only other event during the period, a B4 at 27/0953Z. This region is a Dso group with a beta magnetic classification and grew slightly in sunspot count. Two more regions were numbered today as Regions 1224 (N21W15) and 1225 (N18E55). Region 1224 is a Dso group with a beta magnetic classification and 1225 is another H-type group.

Solar activity is expected to be low with a chance for C-class events, and a slight chance for an M-class event, as regions on the disk continue to evolve.

The geomagnetic field was quiet to unsettled. Observations from the ACE spacecraft suggest the earth is under the continued influence of the co-rotating interaction region in advance of the recurrent coronal hole high speed stream. Solar winds have slowly increased from around 390 to 500 km/s. The IMF Bt averaged around 8 nT with the Bz mostly southward (-8 nT) through the period.

The geomagnetic field is expected to be predominately unsettled with occasional active periods, including isolated minor storm conditions at high-latitudes for day one (28 May). This is expected due to effects from the recurrent coronal hole high speed stream (CH HSS). In addition there are possible effects from the disappearing filament observed on 25 May. Quiet to unsettled conditions, with isolated active levels, are expected for days two and three (29-30 May) with continued CH HSS effects.

  Pozorováno       27 May 090
  Předpovězeno   28 May-30 May  090/095/095
  90 denní průměr        27 May 108

  Pozorováno Afr/Ap 26 May  004/007
  Odhadovaný     Afr/Ap 27 May  010/012
  Předpovězeno    Afr/Ap 28 May-30 May  015/018-010/012-008/008