Viewing archive of Saturday, 18 April 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 Apr 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 108 Issued at 2200Z on 18 APR 1998IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z SOLAR ACTIVITY WAS VERY LOW. QUIET CONDITIONS PREVAILED
ON THE DISK AS MOST OF THE ACTIVE REGIONS EXPERIENCED A STEADY
DECLINE. REGION 8205 (N21W12) IS THE MOST PROMINENT, BUT HAS BEEN
UNPRODUCTIVE DURING THE PAST 24 HOURS. THERE HAS BEEN CONTINUED LIMB
ACTIVITY IN THE SOUTHWEST WHERE REGION 8195 (S27) IS NOW MAKING ITS
LIMB TRANSIT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD
PERSIST AT QUIET TO UNSETTLED LEVELS THROUGHOUT THE PERIOD.
III. Event Probabilities 19 APR to 21 APR
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 18 APR 099 Predicted 19 APR-21 APR 095/095/095 90 Day Mean 18 APR 104
V. Geomagnetic A Indices
OBSERVED AFR/AP 17 APR 012/015 ESTIMATED AFR/AP 18 APR 010/010 PREDICTED AFR/AP 19 APR-21 APR 005/008-005/008-005/008
VI. Geomagnetic Activity Probabilities 19 APR to 21 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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