SOLAR ACTIVITY WAS LOW. FREQUENT C-CLASS FLARES OCCURRED, WITH FIVE REGIONS PARTICIPATING. REGION 9114 (N11W45) IS STILL THE MOST IMPRESSIVE IN WHITE LIGHT AND H-ALPHA. NEWLY NUMBERED REGIONS 9126 (N06W41) AND 9127 (S40E20) EACH HAD SUBFLARES. REGIONS 9124 (S14E52) AND 9125 (N25E55) WERE ACTIVE THROUGHOUT THE DAY.

SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. IIA. GEOPHYSICAL ACTIVITY SUMMARY 10/2100Z TO 11/2100Z: THE GEOMAGNETIC FIELD WAS AT UNSETTLED TO SEVERE STORM LEVELS. A PROLONGED PERIOD OF STEADY SOUTHWARD IMF LASTING MORE THAN 24 HOURS FUELED THE DISTURBANCE. THE BZ MAGNITUDE WAS NEARLY CONSTANT NEAR 10 NT. AT APPROXIMATELY 1800Z, A SHOCK PASSED ACE AND ENDED THE NEAR STEADY-STATE OF THE SOLAR WIND. THE SOLAR WIND SPEED AND DENSITY WERE QUITE AVERAGE PRIOR TO THE SHOCK, BUT ATTAINED VALUES NEAR 600 KM/S, AND 10 P/CC AFTER. THIS TRANSIENT MAY BE RELATED TO THE HALO CME OF 09 AUGUST. A SATELLITE PROTON EVENT AT GREATER THAN 10 MEV BEGAN AT 1650Z. THIS VERY SMALL EVENT REACHED A MAXIMUM OF 17 PFU AT 1655Z AND ENDED AT 1740Z. A SMALL PCA OF APPROXIMATELY 2.0 DB OCCURRED AT THULE CONCURRENT WITH THE PROTON EVENT. THE SOLAR SOURCE OF THE PARTICLES IS AS YET UNDETERMINED. THE GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT ATTAINED HIGH LEVELS LATE IN THE PERIOD.

THE GEOMAGNETIC FIELD IS EXPECTED TO BE AT ACTIVE TO MINOR STORM LEVELS FOR THE NEXT THREE DAYS. EFFECTS FROM TODAY'S SHOCK, IN CONJUNCTION WITH THE PRE-EXISTING AND STILL CONTINUING SOUTHWARD IMF, SHOULD FURTHER EXTEND THE CURRENT DISTURBANCE. LOCAL NIGHTTIMES SHOULD SEE THE PERIODS OF THE STRONGEST ACTIVITY.

  Observed       11 AUG 187
  Predicted   12 AUG-14 AUG  195/200/205
  90 Day Mean        11 AUG 190

OBSERVED AFR/AP 10 AUG  016/023
ESTIMATED AFR/AP 11 AUG  050/060
PREDICTED AFR/AP 12 AUG-14 AUG  020/025-020/020-020/020