SOLAR ACTIVITY WAS MODERATE. REGION 8421 (N26W14) PRODUCED ALL OF TODAY'S FLARES, INCLUDING THE ONLY M-CLASS EVENT: AN M1/SF AT 0546Z. THE GROUP SHOWED SLOW GROWTH TODAY, PRIMARILY BY MEANS OF CONSOLIDATION OF THE LEADER PART OF THE GROUP INTO A SINGLE, LARGE PENUMBRAL REGION. THE REGION PRODUCED FREQUENT SUBFLARES THROUGHOUT THE DAY, 7 OF WHICH WERE LOW-LEVEL C-CLASS EVENTS. IT WOULD APPEAR THAT THE STORAGE OF NON-POTENTIAL MAGNETIC ENERGY IN THE REGION IS PROMPTLY DISSIPATED BY THESE FREQUENT SMALL EVENTS. REGION 8419 (N26W65) DECREASED SLOWLY TODAY AND WAS VERY STABLE. NEW REGION 8425 (S26E50) WAS ASSIGNED TODAY AND IS A SIMPLE, SMALL, BIPOLAR SUNSPOT GROUP.

SOLAR ACTIVITY IS EXPECTED TO BE MODERATE. REGION 8421 IS EXPECTED TO BE THE SOURCE FOR ANY M-CLASS ACTIVITY OVER THE NEXT THREE DAYS. THERE CONTINUES TO BE A CHANCE FOR AN ISOLATED MAJOR FLARE EVENT FROM THIS REGION.

THE GEOMAGNETIC FIELD WAS MOSTLY QUIET TO UNSETTLED. THE FIRST THREE HOURS OF THE REPORTING PERIOD BEGAN WITH MOSTLY UNSETTLED CONDITIONS WITH A FEW HIGH LATITUDE STATIONS REPORTING ACTIVE CONDITIONS. CONDITIONS CALMED SLIGHTLY BETWEEN 0000-0700Z WITH ACTIVITY ON THE BORDERLINE BETWEEN QUIET AND UNSETTLED. SINCE 0700Z, HOWEVER, THE FIELD HAS BEEN VERY QUIET AT ALL LATITUDES. AN EXAMINATION OF THE INTERPLANETARY MAGNETIC FIELD COMPONENT BZ SHOWED A NORTHWARD TURNING OF THE FIELD TO ABOUT +5 NT AT 0500Z.

THE GEOMAGNETIC FIELD IS EXPECTED TO BE UNSETTLED TOMORROW IN RESPONSE TO EFFECTS FROM A FAVORABLY POSITIONED CORONAL HOLE. UNSETTLED CONDITIONS MAY LINGER INTO THE EARLY PART OF THE SECOND DAY, BUT QUIET CONDITIONS SHOULD PREVAIL FOR MOST OF THE SECOND AND THIRD DAYS.

  觀測的       30 DEC 179
  預測的   31 DEC-02 JAN  172/165/160
  90天平均值        30 DEC 136

OBSERVED AFR/AP 29 DEC  010/016
ESTIMATED AFR/AP 30 DEC  004/010
PREDICTED AFR/AP 31 DEC-02 JAN  010/010-007/010-005/007