Viewing archive of Tuesday, 7 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 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 341 Issued at 2200Z on 07 DEC 1999IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z SOLAR ACTIVITY REMAINED LOW. JUST INFREQUENT SMALL
C-CLASS FLARES OCCURRED. REGION 8788 IS STILL THE MOST IMPRESSIVE OF
THE FIVE SPOTTED REGIONS. THE LIMBS WERE QUIET. NEW REGION 8791
(S13E68) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
FORMER REGION 8765 IS DUE TO RETURN IN THE NEXT 24-HOURS AND COULD
POSSIBLY INCREASE THE LEVEL OF SOLAR ACTIVITY.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. THE GREATER THAN 2 MEV
ELECTRONS AT GEOSYNCHRONOUS ORBIT WERE AT MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO ACTIVE. A FULL-HALO CME DETECTED BY THE
LASCO SPACECRAFT ON DECEMBER 6TH COULD POSSIBLY PRODUCE GEOMAGNETIC
AFFECTS ON DECEMBER 8-9.
III. Event Probabilities 08 DEC to 10 DEC
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 07 DEC 153 Predicted 08 DEC-10 DEC 165/180/190 90 Day Mean 07 DEC 166
V. Geomagnetic A Indices
OBSERVED AFR/AP 06 DEC 014/019 ESTIMATED AFR/AP 07 DEC 015/018 PREDICTED AFR/AP 08 DEC-10 DEC 015/015-015/015-012/012
VI. Geomagnetic Activity Probabilities 08 DEC to 10 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 50% | 50% | 40% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 60% | 60% | 50% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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