Viewing archive of Tuesday, 19 May 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 May 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 139 Issued at 2200Z on 19 MAY 1998IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z SOLAR ACTIVITY WAS LOW. AN UNCORRELATED C4 X-RAY EVENT
OCCURRED AT 19/0802Z, WHICH WAS FOLLOWED BY A C3 ERUPTIVE PROMINENCE
ON LIMB FROM DEPARTING REGION 8218 (S18W90) AT 19/1605Z. TWO NEW
SMALL B-TYPE REGIONS WERE NUMBERED TODAY, 8223 (S16W53) AND 8224
(S35E01). THE LARGEST REGION CURRENTLY ON THE VISIBLE DISK, 8222
(N24W31), REMAINED STABLE AS A 17-SPOT 'CAI' BETA GROUP. A 17 DEGREE
LONG BY 6 DEGREE WIDE FILAMENT DISAPPEARED FROM THE NORTHWEST
QUADRANT AT APPROXIMATELY 19/0953Z, WHICH WAS ACCOMPANIED BY AN
IMPORTANCE THREE TYPE II RADIO SWEEP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO CONTINUE
AT VERY LOW TO LOW LEVELS.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED FOR THE PAST 24
HOURS. THE GREATER THAN 2 MEV ELECTRON FLUX RANGED FROM MODERATE TO
HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 20 MAY to 22 MAY
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 19 MAY 099 Predicted 20 MAY-22 MAY 096/098/100 90 Day Mean 19 MAY 109
V. Geomagnetic A Indices
OBSERVED AFR/AP 18 MAY 008/011 ESTIMATED AFR/AP 19 MAY 010/010 PREDICTED AFR/AP 20 MAY-22 MAY 005/008-010/010-010/010
VI. Geomagnetic Activity Probabilities 20 MAY to 22 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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