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

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 090 Issued at 2200Z on 31 MAR 1998

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

SOLAR ACTIVITY WAS LOW. SEVERAL C-CLASS EVENTS OCCURRED TODAY, THE LARGEST OF WHICH WAS A C2/SF AT 0302Z FROM REGION 8190 (S22E36). REGION 8190 HAS SHOWN STEADY GROWTH DURING THE PAST 24 HOURS AND WAS THE SOURCE OF THE MAJORITY OF TODAY'S FLARE ACTIVITY. NEW REGION 8191 (S23E48) WAS ASSIGNED TODAY AND IS A SMALL BIPOLAR GROUP JUST EAST OF 8190. REGION 8185 (S25W51) IS STILL THE LARGEST REGION ON THE DISK BUT WAS DECLINING IN SUNSPOT AREA AND MAGNETIC FIELD INTENSITY. LASCO IMAGES BEGINNING AT 31/0626Z SHOWED A LARGE ERUPTION OF MATERIAL; THE PROJECTION WAS FROM THE SOUTHWESTERN PART OF THE DISK. THE LACK OF ANY CORRESPONDING SIGNATURES ON THE DISK SUGGEST THAT THE SOURCE WAS PROBABLY ON THE BACK SIDE OF THE SUN.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW. THERE CONTINUES TO BE A SLIGHT CHANCE FOR ISOLATED M-CLASS EVENTS. REGION 8190 IS EXPECTED TO BE THE MOST ACTIVE REGION OVER THE NEXT THREE DAYS.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET TO UNSETTLED. MINOR INTENSITY SUBSTORMS WERE RECORDED AT HIGH LATITUDE BETWEEN FROM 0300-0900Z, LEADING TO UNSETTLED LEVELS AT MID-LATITUDE STATIONS AND ACTIVE LEVELS FOR THE PLANETARY INDICES. THE FIELD WAS QUIET AT ALL LATITUDES FOR THE REMAINDER OF THE PERIOD. THE GREATER THAN 2 MEV ELECTRON FLUXES ATTAINED HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE UNSETTLED TO ACTIVE, WITH A CHANCE FOR SOME MINOR STORM LEVEL CONDITIONS, OVER THE NEXT 24-48 HOURS. ENHANCED ACTIVITY IS POSSIBLE BECAUSE OF A TRANSIENT ASSOCIATED WITH THE FILAMENT ERUPTION ON 30 MARCH. CONDITIONS ARE EXPECTED TO RETURN TO UNSETTLED TO QUIET LEVELS BY THE THIRD DAY.
III. Event Probabilities 01 APR to 03 APR
Class M15%15%15%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       31 MAR 108
  Predicted   01 APR-03 APR  110/110/105
  90 Day Mean        31 MAR 099
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 MAR  006/010
ESTIMATED AFR/AP 31 MAR  012/012
PREDICTED AFR/AP 01 APR-03 APR  020/015-012/020-007/015
VI. Geomagnetic Activity Probabilities 01 APR to 03 APR
A. Middle Latitudes
Active50%40%25%
Minor storm20%20%15%
Major-severe storm05%05%05%
B. High Latitudes
Active60%50%25%
Minor storm30%25%20%
Major-severe storm05%05%05%

All times in UTC

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