Viewing archive of Thursday, 19 March 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 Mar 19 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 078 Issued at 2200Z on 19 MAR 1998

IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z

SOLAR ACTIVITY WAS MODERATE. REGION 8183 (N22E44) PRODUCED AN M1/1N FLARE AT 19/0125Z. THIS REGION IS SLOWLY GROWING AND ALSO PRODUCED THREE C-CLASS FLARES IN THE PAST 24 HOURS, THE LARGEST OF WHICH WAS A C7/SF AT 19/1152Z. REGION 8179 (S22W56) HAS BEGUN DECAYING SLOWLY AS IT NEARS THE WEST LIMB. THIS REGION DID NOT PRODUCE ANY SIGNIFICANT ACTIVITY EXCEPT A FEW MINOR SUBFLARES. A REVIEW OF THE LASCO IMAGES FROM YESTERDAY INDICATE ANOTHER PARTIAL HALO/CME OCCURRED CONCURRENT WITH THE UNCORRELATED M1 FLARE AT 18/1112Z. A MAJORITY OF THE CME MASS APPEARED TO HAVE EJECTED FROM THE E-SE SOLAR LIMB AND IS EXPECTED TO HAVE LITTLE GEOEFFECTIVENESS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN LOW TO MODERATE FOR THE ENTIRE FORECAST PERIOD. REGIONS 8179 AND 8183 BOTH HAVE A GOOD CHANCE OF CONTINUED C-CLASS FLARING AND A POTENTIAL FOR ISOLATED M-CLASS ACTIVITY. BOTH REGIONS ALSO HAVE A SMALL CHANCE OF ISOLATED X-CLASS ACTIVITY.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET. THE GREATER THAN 2 MEV ENERGETIC ELCTRON FLUX REMAINED IN THE HIGH RANGES.
IIB. Geophysical Activity Forecast
GEOMAGNETIC ACTIVITY IS EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT 24 HOURS THEN GENERALLY QUIET FOR THE REMAINDER OF THE FORECAST PERIOD IN MID LATITUDES. HIGH LATITUDES MAY EXPERIENCE MOSTLY UNSETTLED ACTIVITY OVER THE ENTIRE FORECAST PERIOD.
III. Event Probabilities 20 MAR to 22 MAR
Class M45%45%35%
Class X10%10%05%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       19 MAR 125
  Predicted   20 MAR-22 MAR  124/122/116
  90 Day Mean        19 MAR 097
V. Geomagnetic A Indices
OBSERVED AFR/AP 18 MAR  004/004
ESTIMATED AFR/AP 19 MAR  004/007
PREDICTED AFR/AP 20 MAR-22 MAR  005/015-005/015-005/012
VI. Geomagnetic Activity Probabilities 20 MAR to 22 MAR
A. Middle Latitudes
Active15%10%10%
Minor storm05%05%05%
Major-severe storm05%01%01%
B. High Latitudes
Active15%10%10%
Minor storm10%05%05%
Major-severe storm05%01%01%

All times in UTC

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