Viewing archive of Friday, 12 November 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 Nov 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 316 Issued at 2200Z on 12 NOV 1999IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z SOLAR ACTIVITY WAS MODERATE. EARLY IN THE PERIOD AN
OPTICALLY UNCORRELATED C4 WAS OBSERVED AT 12/0130Z WITH AN
ASSOCIATED TYPE IV RADIO SWEEP. REGION 8759 (N10E06) PRODUCED AN M1
AT 12/0916Z WHICH WAS OPTICALLY CORRELATED WITH THE LASCO/SOHO EIT
DATA. THE REGION PRODUCED ANOTHER M1/SF AT 12/1154Z. SEVERAL OF THE
TWELVE NUMBERED REGIONS ON THE SOLAR DISK PRODUCED SUBFLARES DURING
THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. A POSSIBILITY OF MAJOR FLARING EXISTS FROM SEVERAL OF
THE REGIONS CURRENTLY TRANSITING THE DISK.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. ACTIVE CONDITIONS WERE
OBSERVED AT MID-LATITUDES DURING THE 11/2100Z PERIOD. ENERGETIC
ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT WERE AT HIGH LEVELS DURING
THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED THROUGH THE FORECAST PERIOD.
ACTIVE LEVELS MAY OCCUR THE FIRST DAY OF THE PERIOD AS THE CURRENT
CORONAL HOLE DISTURBANCE SUBSIDES.
III. Event Probabilities 13 NOV to 15 NOV
| Class M | 70% | 70% | 70% |
| Class X | 15% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 12 NOV 232 Predicted 13 NOV-15 NOV 225/220/215 90 Day Mean 12 NOV 160
V. Geomagnetic A Indices
OBSERVED AFR/AP 11 NOV 022/023 ESTIMATED AFR/AP 12 NOV 012/010 PREDICTED AFR/AP 13 NOV-15 NOV 010/012-008/010-005/008
VI. Geomagnetic Activity Probabilities 13 NOV to 15 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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