Viewing archive of Saturday, 2 January 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 Jan 02 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 002 Issued at 2200Z on 02 JAN 1999IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z SOLAR ACTIVITY DECLINED TO LOW LEVELS. REGION 8421
(N26W53) REMAINED LARGE AND MAGNETICALLY COMPLEX, BUT SHOWED NO
SIGNIFICANT CHANGES IN SIZE OR STRUCTURE. IT PRODUCED ISOLATED
SUBFLARES DURING THE PERIOD. ALL REMAINING SPOT GROUPS WERE SMALL
AND STABLE INCLUDING NEWLY NUMBERED REGIONS 8428 (N23W15) AND 8429
(N34E38).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8421 MAY PRODUCE AN ISOLATED M-CLASS FLARE.
THERE IS ALSO A SLIGHT CHANCE FOR A MAJOR FLARE FOM THIS REGION.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 03 JAN to 05 JAN
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 02 JAN 160 Predicted 03 JAN-05 JAN 160/155/155 90 Day Mean 02 JAN 137
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 JAN 004/005 ESTIMATED AFR/AP 02 JAN 006/008 PREDICTED AFR/AP 03 JAN-05 JAN 005/010-005/008-005/005
VI. Geomagnetic Activity Probabilities 03 JAN to 05 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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