Solar activity remained at low levels. The two largest x-ray flares of the period were optically uncorrelated: A C9.5 flare at 11/1147 UTC, and a C7.9 flare at 11/1801 UTC. LASCO imagery revealed no evident CME activity following the first event, and was unavailable for the second event, however neither event was accompanied by any significant CME-related radio emissions. A 19-degree filament disappearance occurred near N28W51 at about 11/0700, close to the western end of a long filament channel that extends to the northeast limb. No CME was evident in available LASCO imagery following this event. Regions 61 (N07W28), 66 (N13E42), and newly numbered 69 (S08E77) were all sources of lesser C-class activity. Region 61 appears to be undergoing an accelerated decay in size and complexity. New Region 69 appears large and complex in white light, but its limb proximity prevents a detailed magnetic analysis. Three other regions were also numbered: 70 (N05W05), 71 (N11E68), and 72 (N18W23). All appear relatively simply structured at present. 10cm flux experienced a rapid rise with the appearance of the new regions.

Solar activity is expected to be predominantly low, but with a fair chance for isolated M-class activity over the next three days, primarily due to new Region 69.

The geomagnetic field was quiet to active. A trend toward elevated solar wind speed and sustained southward Bz appeared to persist for most of the day, and may indicate the early influence of expected high speed stream effects.

The geomagnetic field is expected to range from quiet to active conditions for the next three days.

  Observé       11 Aug 172
  Prévisionnel   12 Aug-14 Aug  175/180/185
  Moyenne des 90 derniers jours        11 Aug 164

  Observé Afr/Ap 10 Aug  013/016
  Estimé     Afr/Ap 11 Aug  013/018
  Prévisionnel    Afr/Ap 12 Aug-14 Aug  012/012-015/015-012/012