Solar activity was at low levels due a to C1/Sf flare at 02/1516Z from Region 1281 (S20E01). During the period, the region decayed slightly in area and spot count and remained a D-type, bi-polar spot group. Region 1283 (N13E37) produced an impulsive B8/Sf flare at 02/0852Z. The region showed penumbral development in the trailer spots and was classified as a D-type, bi-polar spot group. Region 1282 (N25W40) indicated an increase in area and longitudinal extent and was classified as an E-type, bi-polar spot group. A CME was observed lifting off the SE limb, first seen in SOHO LASCO/C2 imagery at 02/0748Z. A plane-of-sky speed was estimated at 375 km/s. The source of this CME appears to have originated from a filament channel centered near S28E42. Material motion was first observed on SDO/AIA 193 imagery at 02/0554Z. At this time, there does not appear to be an Earthward-directed component.

Solar activity is expected to be low through the period (03 - 05 September) with a slight chance for M-class activity.

The geomagnetic field was quiet. Solar wind speeds, as measured at the ACE spacecraft, were steady below 300 km/s through the period. A phi angle change from negative (toward) to positive (away) was observed at approximately 02/0900Z. The Bz component of the interplanetary magnetic field was predominately negative through the period at about -4 nT.

The geomagnetic field is expected to be at quiet to unsettled levels, with a slight chance for active periods, on days one and two (03 - 04 September). This increase in activity is due to a recurrent coronal hole high speed stream expected to rotate into a geoeffective position early on 03 September. By day three (05 September), field activity is expected to return to mostly quiet levels.

  Pozorováno       02 Sep 115
  Předpovězeno   03 Sep-05 Sep  115/115/110
  90 denní průměr        02 Sep 097

  Pozorováno Afr/Ap 01 Sep  001/003
  Odhadovaný     Afr/Ap 02 Sep  003/005
  Předpovězeno    Afr/Ap 03 Sep-05 Sep  008/008-008/008-005/005