Viewing archive of Thursday, 2 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 02 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 336 Issued at 2200Z on 02 DEC 1999IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z SOLAR ACTIVITY PERSISTS AT THE LOW LEVEL. AN
UNASSOCIATED C5 AT 1012Z WAS THE DAY'S LARGEST EVENT. REGION 8782
(N11W68) HAD FREQUENT SUBFLARES EARLY IN THE PERIOD. REGION 8781
(S12W29) ALSO CONTRIBUTED AN OCCASIONAL SMALL FLARE. THE DISK IS
CHARACTERIZED BY A NUMBER OF SMALL EMERGING SUNSPOT GROUPS,
DISTRIBUTED THROUGHOUT ALL HELIOLONGITUDES. ALL ARE IN A RUDIMENTARY
STAGE NOW.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO PERSIST
AT LOW LEVELS FOR THE NEXT THREE DAYS. AN INCREASE IN FLARE ACTIVITY
IS POSSIBLE IF ANY OF THE EMERGING ACTIVE CENTERS CONTINUES TO
DEVELOP.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN AT QUIET CONDITIONS FOR THE NEXT 24 HOURS. A
HIGH-SPEED SOLAR WIND STREAM, EMANATING FROM A LARGE SOUTHERN
CORONAL HOLE, SHOULD CAUSE UNSETTLED TO ACTIVE CONDITIONS THE LAST
TWO DAYS OF THE INTERVAL.
III. Event Probabilities 03 DEC to 05 DEC
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 02 DEC 166 Predicted 03 DEC-05 DEC 170/180/190 90 Day Mean 02 DEC 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 DEC 002/004 ESTIMATED AFR/AP 02 DEC 002/005 PREDICTED AFR/AP 03 DEC-05 DEC 005/005-010/015-015/020
VI. Geomagnetic Activity Probabilities 03 DEC to 05 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 20% | 30% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 25% | 40% |
| Minor storm | 01% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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