Viewing archive of Sunday, 7 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 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 311 Issued at 2200Z on 07 NOV 1999IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z SOLAR ACTIVITY REMAINED AT LOW LEVELS. REGION 8759
(N08E70) PRODUCED A SINGLE C-CLASS SUBFLARE EARLY IN THE PERIOD. IT
IS A MODERATE-SIZED GROUP WITH A COMPACT SPOT DISTRIBUTION AND A
MODERATELY COMPLEX MAGNETIC STRUCTURE. REGION 8757 (N36W16) SHOWED
SLOW GROWTH EARLY IN THE PERIOD AS IT PRODUCED A FEW SUBFLARES, BUT
STABILIZED SHORTLY THEREAFTER. REGION 8749 (S18W76) CONTINUED TO
SHOW A SLIGHT DEGREE OF MAGNETIC COMPLEXITY, BUT WAS STABLE AS IT
APPROACHED THE WEST LIMB. MINOR GROWTH WAS NOTED WITHIN REGION 8753
(N20E16) AND (NEWLY NUMBERED) REGION 8760 (N13E35). BOTH REGIONS
APPEARED TO BE SIMPLY-STRUCTURED BIPOLES.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE AT
LOW TO MODERATE LEVELS. REGION 8759 MAY PRODUCE ISOLATED M-CLASS
FLARES DURING THE PERIOD.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
GEOMAGNETIC FIELD ACTIVITY INCREASED EARLY IN THE PERIOD WITH THE
ONSET OF CORONAL HOLE EFFECTS. ACE REAL-TIME SOLAR WIND DATA
INDICATED A TRANSITION TO A CORONAL HOLE WINDSTREAM BEGINNING
ROUGHLY 06/2300Z. FIELD ACTIVITY INCREASED TO UNSETTLED TO MINOR
STORM LEVELS SHORTLY THEREAFTER WITH STORM LEVELS MOSTLY LIMITED TO
HIGH LATITUDES.
IIB. Geophysical Activity Forecast
ACTIVE TO MINOR STORM LEVELS
ARE EXPECTED AS CORONAL HOLE EFFECTS CONTINUE THROUGH THE PERIOD.
THE GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT IS
EXPECTED TO INCREASE TO MODERATE TO HIGH LEVELS EARLY IN THE
FORECAST PERIOD.
III. Event Probabilities 08 NOV to 10 NOV
| Class M | 40% | 40% | 40% |
| Class X | 10% | 10% | 10% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 07 NOV 174 Predicted 08 NOV-10 NOV 180/185/190 90 Day Mean 07 NOV 154
V. Geomagnetic A Indices
OBSERVED AFR/AP 06 NOV 005/007 ESTIMATED AFR/AP 07 NOV 022/025 PREDICTED AFR/AP 08 NOV-10 NOV 020/025-020/030-020/035
VI. Geomagnetic Activity Probabilities 08 NOV to 10 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 40% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 45% | 45% | 45% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 10% | 10% | 10% |
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