SOLAR ACTIVITY WAS HIGH. REGION 8100 (S19W68) PRODUCED THE LARGEST FLARE YET OF THE NEW SOLAR CYCLE, AN X9/2B PEAKING AT 06/1155Z. THIS FLARE WAS ASSOCIATED WITH RADIO BURSTS OF 54000 SFU AT 245 MHZ, 3300 SFU AT 2695 MHZ AND A STRONG TYPE IV SWEEP. THE SUNSPOT GROUP APPEARS TO HAVE SIMPLIFIED SOMEWHAT SINCE THE MAJOR FLARE, REDUCING PENUMBRAL AREA AND MAGNETIC COMPLEXITY. SUNSPOT POLARITY DATA SUGGEST THAT THE DELTA CONFIGURATIONS OBSERVED YESTERDAY ARE NO LONGER PRESENT. CORONAL INSTRUMENTS ON THE SOHO SATELLITE OBSERVED A "WIDE" (ABOUT 100 DEGREE) CME OFF THE WEST SOLAR LIMB COINCIDENT WITH THE X-RAY EVENT.

SOLAR ACTIVITY IS EXPECTED TO BE MODERATE TO HIGH. THE LIKELIHOOD OF IMMINENT MAJOR FLARES IN REGION 8100 HAS DIMINISHED IN THE WAKE OF TODAY'S MAJOR EVENT. HOWEVER, THIS REGION IS STILL LARGE AND HAS THE POTENTIAL FOR M-CLASS ACTIVITY, OR EVEN ANOTHER X-CLASS FLARE, BEFORE IT ROTATES AROUND THE WEST LIMB IF MAGNETIC ENERGY REGENERATES.

THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE X-CLASS EVENT DESCRIBED IN PART IA. PRODUCED PROTON EVENTS AT GREATER THAN 10 AND 100 MEV WHICH REMAIN IN PROGRESS AT THIS TIME. THE GREATER THAN 100 MEV EVENT CROSSED THE EVENT THRESHOLD OF 1 PFU AT 06/1245Z AND APPEARS TO HAVE REACHED A PEAK FLUX OF 51 PFU AT 06/1640Z. THE GREATER THAN 10 MEV EVENT CROSSED THE 10 PFU EVENT THRESHOLD AT 06/1305Z AND HAS NOT YET PEAKED (06/2100Z FLUX 340 PFU). THE PCA ASSOCIATED WITH THIS FLARE BEGAN AT ABOUT 06/1400Z AND REMAINS IN PROGRESS. CURRENT (06/2100Z) PCA ABSORPTION AT THULE GREENLAND IS ESTIMATED TO BE 5.6 DB. THIS X9 FLARE PRODUCED THE FIRST GROUND LEVEL EVENT (GLE) OF THE SOLAR CYCLE (LAST GLE IN 1992). THE GLE STARTED AT ABOUT 06/1220Z, PEAKED WITH ABOUT A 10% INCREASE ABOVE BACKGROUND AT 06/1355Z, AND APPEARS TO HAVE ENDED AT 06/2000Z.

THE GEOMAGNETIC FIELD IS EXPECTED TO REACH STORM LEVELS BY TOMORROW DUE TO THE MAJOR SOLAR EVENTS OBSERVED ON 4 NOVEMBER. DISTURBED CONDITIONS SHOULD CONTINUE FOR THE NEXT FEW DAYS, STARTED BY THE 4 NOV EVENT AND CONTRIBUTED TO BY TODAY'S SOLAR ACTIVITY. THIS FORECAST (ACTIVITY DURATION AND INTENSITY) WILL BE UPDATED AFTER THE GEOMAGNETIC ACTIVITY ONSET.

  Osservato       06 NOV 105
  Previsto   07 NOV-09 NOV  100/095/090
  Media di 90 Giorni        06 NOV 089

OBSERVED AFR/AP 05 NOV  008/009
ESTIMATED AFR/AP 06 NOV  010/012
PREDICTED AFR/AP 07 NOV-09 NOV  050/060-030/035-020/010