Viewing archive of Sunday, 23 August 1998

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 1998 Aug 23 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 235 Issued at 2200Z on 23 AUG 1998

IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z

SOLAR ACTIVITY WAS MODERATE. REGION 8307 (N31E22) PRODUCED AN M2/1N FLARE AT 23/0934Z WITH A 2695 MHZ BURST OF 500 SFU. THIS REGION BEGAN A DECAY TREND DURING THE PERIOD. THE DELTA CONFIGURATION REMAINED IN THE NORTHERN PORTION OF THE REGION BUT OVERALL, THE MAGNETIC COMPLEXITY IS DECREASING. REGION 8310 (N24E33) PRODUCED A C3/SF FLARE AT 23/1125Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BECOME LOW TO MODERATE. CONTINUED DECAY AND SIMPLIFICATION IN REGION 8307 COULD RESULT IN A RAPID DECREASE OF FLARE PRODUCTION. ONLY OCCASIONAL M-CLASS EVENTS ARE EXPECTED FOR THE NEXT THREE DAYS. X-CLASS FLARES REMAIN SLIGHTLY POSSIBLE FROM THIS REGION THAT PRODUCED A TOTAL OF 4 X-CLASS EVENTS EARLY IN ITS VISIBLE HEMISPHERE TRANSIT.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD WAS UNSETTLED AT MIDDLE LATITUDES AND UNSETTLED TO MINOR STORM LEVELS AT HIGH LATITUDES. THE MOST DISTURBED PERIOD WAS FROM 23/0000-0900Z. RECENT SOLAR WIND DATA SHOW AN INCREASE OF SOLAR WIND VELOCITY TO NEAR 600 KM/S AND DECREASE OF DENSITY TO 2-3 P/CC. THESE PARAMETERS INDICATE THE EARTH IS EMBEDDED IN A CORONAL HOLE STREAM. MAGNETIC DATA IMPLICATE THE EQUATORWARD EXTENSION OF THE NORTHERN CORONAL HOLE AS THE SOURCE OF THIS STREAM. THE ENERGETIC (GT 10 MEV) PROTON ENHANCEMENT THAT BEGAN ON 20 AUG CONTINUED THROUGH THE PERIOD AT A FLUX OF APPROXIMATELY 2 PFU.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD CONTINUE AT PREDOMINANTLY UNSETTLED TO ACTIVE LEVELS THROUGH 24 AUG. MINOR STORM INTERVALS ARE POSSIBLE DURING THAT TIME. A SLIGHTLY MORE INTENSE DISTURBANCE IS EXPECTED ON 25-26 AUG AS A RESULT OF THE M9 FLARE AND SUSPECTED CME OF 22 AUG. ACTIVE TO MINOR STORM LEVELS WITH ISOLATED PERIODS OF MAJOR STORMING ARE POSSIBLE FOR THAT PERIOD. THE PROTON ENHANCEMENT SHOULD DECAY SLOWLY OVER THE NEXT SEVERAL DAYS.
III. Event Probabilities 24 AUG to 26 AUG
Class M55%55%55%
Class X20%20%20%
Proton20%20%20%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       23 AUG 126
  Predicted   24 AUG-26 AUG  127/128/130
  90 Day Mean        23 AUG 116
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 AUG  013/023
ESTIMATED AFR/AP 23 AUG  015/020
PREDICTED AFR/AP 24 AUG-26 AUG  020/020-025/020-025/030
VI. Geomagnetic Activity Probabilities 24 AUG to 26 AUG
A. Middle Latitudes
Active40%30%30%
Minor storm20%30%30%
Major-severe storm05%15%15%
B. High Latitudes
Active40%30%30%
Minor storm25%30%30%
Major-severe storm10%20%20%

All times in UTC

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