Viewing archive of Thursday, 2 September 1999

Solar activity report

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 1999 Sep 02 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 245 Issued at 2200Z on 02 SEP 1999

IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z

SOLAR ACTIVITY HAS BEEN LOW FOR THE PAST 24 HOURS. MOST OF THE 8 SPOTTED REGIONS DECLINED IN WHITE LIGHT AND MAGNETIC COMPLEXITY. HOWEVER ONE REGION EMERGED RAPIDLY NEAR N10W06 AND WAS NUMBERED AS REGION 8687. REGION 8675 (N19W41) PRODUCED A C6/2F LONG DURATION FLARE THAT MAXED AT 1828 UT. A FILAMENT NEAR N25W05 DISAPPEARED BETWEEN 01/1923 AND 02/0720 UT. ANOTHER DARK FILAMENT NEAR S30W15 DISAPPEARED BETWEEN 02/0720-1527 UT IN A PARTICULARLY INTERESTING AREA OF EVOLVING LARGE-SCALE MAGNETIC FIELDS. AN ERUPTIVE PROMINENCE THAT COULD BE SEEN OUT TO 0.49 SOLAR RADIUS WAS OBSERVED ON THE SOUTHEAST LIMB (S27) NEAR 1400 UT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW FOR THE NEXT THREE DAYS. REGIONS 8681 (N21W56) AND 8675 HAVE A SMALL PROBABILITY OF ISOLATED M-CLASS X-RAY FLARES.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
GEOMAGNETIC CONDITIONS HAVE RANGED BETWEEN QUIET AND ACTIVE FOR THE LAST 24 HOURS. THE GEOMAGNETIC FIELD IS CONTINUING TO BE INFLUENCED BY A STEADY, POSITIVE POLARITY (AWAY) SOLAR WIND STREAM OF MODERATE SPEED (NEAR 450 KM/S). THE INTERPLANETARY MAGNETIC FIELD INTENSITY WAS APPROXIMATELY 10 NT, AND WAS PREDOMINATELY SOUTHWARD,
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO PERSIST AT UNSETTLED TO OCCASIONALLY ACTIVE LEVELS TOMORROW, DECREASING TOWARD GENERALLY UNSETTLED CONDITIONS BY THE END OF THE FORECAST PERIOD. HOWEVER, DISTURBED SOLAR WIND FROM ANY OF THE SEVERAL ERUPTIVE EVENTS OBSERVED TODAY MAY RAISE ACTIVITY TO NEAR-STORM LEVELS ON SEPTEMBER 6 AND 7.
III. Event Probabilities 03 SEP to 05 SEP
Class M30%20%20%
Class X10%05%05%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       02 SEP 157
  Predicted   03 SEP-05 SEP  150/140/130
  90 Day Mean        02 SEP 168
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 SEP  014/022
ESTIMATED AFR/AP 02 SEP  010/012
PREDICTED AFR/AP 03 SEP-05 SEP  015/010-010/010-010/010
VI. Geomagnetic Activity Probabilities 03 SEP to 05 SEP
A. Middle Latitudes
Active15%05%05%
Minor storm10%05%05%
Major-severe storm05%01%01%
B. High Latitudes
Active20%20%20%
Minor storm15%10%10%
Major-severe storm05%05%01%

All times in UTC

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