Viewing archive of Thursday, 16 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 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 106 Issued at 2200Z on 16 APR 1998IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z SOLAR ACTIVITY WAS LOW. REGION 8203 (N31W41) STABILIZED
DURING THE PERIOD AND WAS THE LIKELY SOURCE OF A C9 X-RAY BURST AT
0111Z. NEW REGION 8204 (S15E12) WAS BORN ON THE DISK.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
ADDITIONAL C-CLASS EVENTS ARE LIKELY FROM REGION 8203.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMANGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED EARLY IN THE INTERVAL, THEN QUIET BY 19
APRIL. A RECURRENT HIGH-SPEED STREAM SHOULD ELEVATE ACTIVITY TO A
SLIGHT DEGREE ON 17 APRIL.
III. Event Probabilities 17 APR to 19 APR
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 APR 106 Predicted 17 APR-19 APR 100/100/095 90 Day Mean 16 APR 104
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 APR 003/004 ESTIMATED AFR/AP 16 APR 007/005 PREDICTED AFR/AP 17 APR-19 APR 015/015-010/010-005/005
VI. Geomagnetic Activity Probabilities 17 APR to 19 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 15% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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