SOLAR ACTIVITY WAS LOW. REGION 9140 (N11W67) PRODUCED TODAY'S LARGEST EVENT, A C9/1N AT 1820Z WHICH WAS ACCOMPANIED BY A TYPE II SWEEP. AN ASSOCIATED CME WAS OBSERVED OVER THE SOUTHWEST LIMB IN THE LASCO C2 FIELD OF VIEW, BEGINNING AT 1854Z. REGION 9140 APPEARS TO BE DECLINING. REGION 9143 (S18W32) ALSO SEEMS TO BE ON THE DECLINE, BUT DID MANAGE TO PRODUCE A C1/SF AT 0606Z. REGION 9149 (N14E18), THE LARGEST GROUP ON THE DISK, CONTINUES TO GROW SLOWLY, BUT REMAINS VERY STABLE. TWO NEW, SMALL ACTIVE REGIONS WERE ASSIGNED DURING THE PAST 24 HOURS: 9153 (S33E16) AND 9154 (S21E44).

SOLAR ACTIVITY IS EXPECTED TO BE MOSTLY LOW, BUT THERE CONTINUES TO BE A SLIGHT-TO-FAIR CHANCE FOR AN ISOLATED M-CLASS EVENT DURING THE NEXT THREE DAYS. IIA. GEOPHYSICAL ACTIVITY SUMMARY 31/2100Z TO 01/2100Z: THE GEOMAGNETIC FIELD WAS UNSETTLED TO ACTIVE. THE ENHANCED ACTIVITY LEVELS CONTINUE AS A CONSEQUENCE OF THE ONGOING, BUT WEAKENING HIGH-SPEED CORONAL HOLE SOLAR WIND STREAM. THE GREATER THAN 2 MEV ELECTRON FLUX LEVELS AT GEOSYNCHRONOUS ALTITUDE CONTINUE TO BE HIGH.

THE GEOMAGNETIC FIELD IS EXPECTED TO BE MOSTLY UNSETTLED DURING THE NEXT 24 HOURS, ALTHOUGH THERE IS A CHANCE FOR AN ISOLATED ACTIVE PERIOD. MOSTLY UNSETTLED CONDITIONS SHOULD PREVAIL DURING THE SECOND AND THIRD DAYS OF THE FORECAST PERIOD.

  觀測的       01 SEP 158
  預測的   02 SEP-04 SEP  155/155/155
  90天平均值        01 SEP 181

OBSERVED AFR/AP 31 AUG  012/015
ESTIMATED AFR/AP 01 SEP  015/018
PREDICTED AFR/AP 02 SEP-04 SEP  012/012-010/010-010/010