Viewing archive of Saturday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 317 Issued at 2200Z on 13 NOV 1999IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8763 (S14E32)
PRODUCED TWO LONG DURATION EVENTS DURING THE PERIOD. THE FIRST WAS A
M1/1F AT 13/0258Z AND THE SECOND WAS A C6/1F AT 13/1623Z. THIS
REGION HAS DECREASED IN AREA FROM YESTERDAY BUT HAS MAINTAINED A
STRONG MAGNETIC COMPLEXITY. SEVERAL OTHER REGIONS PRODUCED SUBFLARES
THROUGHOUT THE PERIOD. REGION 8760 (N14W45) REMAINS THE LARGEST
REGION ON THE SOLAR DISK WITH AN AREA OF 570 MILLIONTHS. A NEW
REGION WAS NUMBERED TODAY AS REGION 8766 (N18E68).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
GENERALLY MODERATE. SEVERAL REGIONS HAVE M-CLASS FLARE POTENTIAL
WITH A SMALL CHANCE FOR AN X-CLASS EVENT.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD WAS UNSETTLED TO ACTIVE. MINOR STORM CONDITIONS
WERE OBSERVED AT HIGH LATITUDES AT 13/1500Z AND 13/2100Z. PROLONGED
PERIODS OF NEGATIVE BZ IN THE SOLAR WIND HAVE LED TO THESE
CONDITIONS. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT
REMAINED AT HIGH LEVELS DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE GENERALLY QUIET TO UNSETTLED. PERIODS OF ACTIVE
CONDITIONS ARE POSSIBLE THE FIRST DAY AS A CONSEQUENCE OF ONGOING
SOUTHWARD BZ IN THE SOLAR WIND.
III. Event Probabilities 14 NOV to 16 NOV
| Class M | 70% | 70% | 70% |
| Class X | 15% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 NOV 224 Predicted 14 NOV-16 NOV 220/215/210 90 Day Mean 13 NOV 161
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 NOV 013/010 ESTIMATED AFR/AP 13 NOV 020/025 PREDICTED AFR/AP 14 NOV-16 NOV 008/012-008/012-010/018
VI. Geomagnetic Activity Probabilities 14 NOV to 16 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 30% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 40% |
| Minor storm | 15% | 15% | 25% |
| Major-severe storm | 05% | 05% | 10% |
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