Viewing archive of Monday, 31 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 31 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 243 Issued at 2200Z on 31 AUG 1998

IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z

SOLAR ACTIVITY WAS MODERATE. REGION 8307 (N31W76) PRODUCED AN IMPULSIVE M1/SF FLARE AT 1539Z WHICH WAS ACCOMPANIED BY A TYPE II RADIO SWEEP. THE REGION ALSO PRODUCED TWO C-CLASS FLARES DURING THE PAST 24 HOURS. REGION 8319 (N18W54) CONTINUED TO GROW TODAY, BUT NOT AS RAPIDLY AS YESTERDAY. FLARES FROM THIS GROUP OCCURRED LESS FREQUENTLY THAN YESTERDAY AND CONSISTED OF A FEW C-CLASS SUBFLARES. THE GROUP HAS STRONG MAGNETIC FIELDS THAT ARE IN A BETA CONFIGURATION WITH A NORTH-SOUTH INVERSION LINE. REGION 8323 (S21E54) HAS ROTATED INTO VIEW AS A LARGE COMPACT GROUP. THERE APPEARS TO BE A DELTA CONFIGURATION IN A PENUMBRAL AREA NEAR THE MIDDLE OF THE GROUP. IN SPITE OF THE SIZE AND COMPLEXITY OF THE GROUP IT PRODUCED ONLY A FEW C-CLASS SUBFLARES DURING THE PAST 24 HOURS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE MODERATE. THERE CONTINUES TO BE A CHANCE, HOWEVER, FOR A MAJOR FLARE EVENT FROM ANY OF REGIONS 8307, 8319, OR 8323.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE LEVELS, WITH SOME MINOR STORM PERIODS AT HIGH LATITUDES. A QUIET TO UNSETTLED FIELD BECAME ACTIVE TO MINOR STORM BETWEEN 0600-1200Z. REAL-TIME SOLAR WIND CONTINUES TO SHOW THE SAME HIGH SPEED, LOW DENSITY SOLAR WIND THAT HAS PERSISTED OVER THE LAST 4 DAYS. THE INTERPLANETARY MAGNETIC FIELD, HOWEVER, TRANSITIONED TO A MORE CONSISTENTLY SOUTHWARD DIRECTION (MOSTLY FROM -3 TO -7 NT), DURING THE ENHANCED GEOMAGNETIC ACTIVITY INTERVAL. THE FIELD CONTINUED TO BE ACTIVE FROM 1200-1800Z, BUT APPEARED TO BE CALMING SOMEWHAT DURING THE LAST 3 HOURS. THE GREATER THAN 2 MEV ELECTRON FLUX CONTINUES TO BE HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE MOSTLY UNSETTLED WITH OCCASIONAL ACTIVE PERIODS OVER THE NEXT THREE DAYS.
III. Event Probabilities 01 SEP to 03 SEP
Class M70%65%60%
Class X20%20%15%
Proton25%20%15%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       31 AUG 179
  Predicted   01 SEP-03 SEP  180/175/175
  90 Day Mean        31 AUG 120
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 AUG  011/015
ESTIMATED AFR/AP 31 AUG  015/023
PREDICTED AFR/AP 01 SEP-03 SEP  015/015-015/015-015/012
VI. Geomagnetic Activity Probabilities 01 SEP to 03 SEP
A. Middle Latitudes
Active50%45%40%
Minor storm20%20%20%
Major-severe storm10%10%10%
B. High Latitudes
Active40%40%40%
Minor storm30%30%30%
Major-severe storm15%15%15%

All times in UTC

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