Viewing archive of Wednesday, 12 May 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 May 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 132 Issued at 2200Z on 12 MAY 1999IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z SOLAR ACTIVITY HAS BEEN LOW. TWO C-CLASS X-RAY FLARES
WERE OBSERVED WITH THE LARGEST A C4/SF AT 11/2208Z. THE FLARE WAS
OPTICALLY CORRELATED WITH A NEW REGION NUMBERED TODAY AS REGION 8542
(S19E58).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE THROUGH THE FORECAST PERIOD.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
THE GEOMAGNETIC FIELD WAS PREDOMINATELY QUIET THROUGH THE PERIOD WITH
UNSETTLED CONDITIONS AFTER 12/1800Z. THE GREATER THAN 2 MEV
ELECTRONS AT GEOSYNCHRONOUS ORBITS WERE AT MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT UNSETTLED TO ACTIVE CONDITIONS THE FIRST DAY OF
THE FORECAST DUE TO THE CME OBSERVED EARLY ON 10 MAY. QUIET TO
UNSETTLED CONDITIONS ARE FORECAST FOR THE REMAINDER OF THE PERIOD.
III. Event Probabilities 13 MAY to 15 MAY
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 12 MAY 153 Predicted 13 MAY-15 MAY 150/145/145 90 Day Mean 12 MAY 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 11 MAY 001/005 ESTIMATED AFR/AP 12 MAY 010/010 PREDICTED AFR/AP 13 MAY-15 MAY 020/020-010/012-010/010
VI. Geomagnetic Activity Probabilities 13 MAY to 15 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 15% |
| Minor storm | 20% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 20% |
| Minor storm | 25% | 15% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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