Viewing archive of Wednesday, 14 April 1999
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 1999 Apr 14 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 104 Issued at 2200Z on 14 APR 1999IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z SOLAR ACTIVITY HAS BEEN VERY LOW. ALL REGIONS ON THE
SOLAR DISK HAVE BEEN STABLE. A NEW REGION WAS NUMBERED TODAY AS
REGION 8516 (S22E66).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS THE FIRST DAY OF THE
FORECAST. ACTIVE CONDITIONS ARE EXPECTED THE SECOND AND THIRD DAY AS
A RESULT OF THE CORONAL MASS EJECTION ON 13 APRIL.
III. Event Probabilities 15 APR to 17 APR
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 14 APR 120 Predicted 15 APR-17 APR 118/115/112 90 Day Mean 14 APR 135
V. Geomagnetic A Indices
OBSERVED AFR/AP 13 APR 002/005 ESTIMATED AFR/AP 14 APR 005/007 PREDICTED AFR/AP 15 APR-17 APR 010/012-020/025-020/020
VI. Geomagnetic Activity Probabilities 15 APR to 17 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 30% | 30% |
| Minor storm | 10% | 20% | 20% |
| Major-severe storm | 05% | 10% | 10% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 35% | 35% |
| Minor storm | 10% | 25% | 25% |
| Major-severe storm | 05% | 15% | 15% |
All times in UTC
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