Viewing archive of Friday, 3 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 03 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 337 Issued at 2200Z on 03 DEC 1999IA. Analysis of Solar Active Regions and Activity from 02-2100Z to 03-2100Z SOLAR ACTIVITY WAS LOW. THE DAY'S LARGEST EVENT WAS AN
UNOBSERVED IMPULSIVE C6 AT 1953Z. FOUR NEW ACTIVE REGIONS WERE
NUMBERED DURING THE PERIOD. THEY ARE 8786 (N22W23), 8787 (N11E30),
8788 (N10E66), AND 8789 (N29W23). SATELLITE DATA SUGGEST YET ANOTHER
REGION MAY BE SOON TO APPEAR AROUND N10 AT THE EAST LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO CONTINUE
AT THE LOW LEVEL.
IIA. Geophysical Activity Summary 02-2100Z to 03-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. SOLAR WIND DATA INDICATE
ELEVATED SOLAR WIND SPEEDS, CHARACTERISTIC OF A CORONAL HOLE-RELATED
STREAM.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE FOR THE NEXT THREE DAYS. THE HIGH
SPEED STREAM SHOULD PERSIST THROUGHOUT THE PERIOD.
III. Event Probabilities 04 DEC to 06 DEC
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 03 DEC 152 Predicted 04 DEC-06 DEC 160/170/180 90 Day Mean 03 DEC 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 02 DEC 003/004 ESTIMATED AFR/AP 03 DEC 014/014 PREDICTED AFR/AP 04 DEC-06 DEC 015/020-015/025-015/018
VI. Geomagnetic Activity Probabilities 04 DEC to 06 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 40% | 40% |
| Minor storm | 10% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 50% | 50% |
| Minor storm | 15% | 20% | 20% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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