Solar activity was low with one C-class flare produced by Region 910 (S10W18). Seeing conditions at all optical sites have ranged from poor to non-existent so there is some disagreement in the magnetic classification of this region, however, a classification of Beta seems most likely. The San Vito optical site reported a Type II radio sweep from 23/1106Z - 23/1114Z with an estimated shock speed of 711 km/s. No current imagery is available to aid in determining the possibility that a CME may be associated with this radio event or in identifying the location of this event. Within an hour of the radio sweep GOES 11 experienced an enhancement of >1 MeV proton flux which peaked at 1800Z and is now decreasing.

Solar activity is expected to be very low. There remains a slight chance for a C-class flare from Region 910.

The geomagnetic field was quiet with one unsettled period. Activity is due to both the occurrence of a solar sector boundary crossing and the beginning of a coronal hole high speed stream now rotating into a geoeffective position. The greater than 2 MeV electron flux was at high levels again today, however, at approximately 1930Z flux decreased to below the threshold level for the first time in several days.

The geomagnetic field is expected to range from quiet to active levels with some isolated minor storm periods. This activity is due to a recurrent coronal hole high speed stream.

  Observed       23 Sep 070
  Predicted   24 Sep-26 Sep  075/075/075
  90 Day Mean        23 Sep 076

  Observed Afr/Ap 22 Sep  001/003
  Estimated     Afr/Ap 23 Sep  010/010
  Predicted    Afr/Ap 24 Sep-26 Sep  010/020-006/008-008/008