Viewing archive of Saturday, 11 December 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 Dec 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 345 Issued at 2200Z on 11 DEC 1999IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. ONLY A COUPLE OF MINOR C-CLASS
EVENTS WERE OBSERVED DURING THE PERIOD. REGION 8794 (S14E31)
PRODUCED A C2/1F EVENT AT 11/0333Z. NO NEW REGIONS WERE NUMBERED
TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
WITH A SLIGHT CHANCE OF AN ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. THE GREATER THAN 2 MEV
ENERGETIC ELECTRONS AT GEOSYNCHRONOUS ORBIT WERE AT HIGH LEVELS
DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE PREDOMINATELY QUIET TO UNSETTLED. THERE IS A
POSSIBILITY OF ACTIVE CONDITIONS THE FIRST DAY DUE TO A SOLAR
DISTURBANCE IN THE WESTERN SOLAR HEMISPHERE ON 09 DECEMBER.
III. Event Probabilities 12 DEC to 14 DEC
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 DEC 159 Predicted 12 DEC-14 DEC 170/180/185 90 Day Mean 11 DEC 168
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 DEC 008/007 ESTIMATED AFR/AP 11 DEC 010/010 PREDICTED AFR/AP 12 DEC-14 DEC 010/010-010/015-010/015
VI. Geomagnetic Activity Probabilities 12 DEC to 14 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 20% | 20% |
| Minor storm | 20% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 30% | 30% |
| Minor storm | 25% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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