Viewing archive of Friday, 1 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 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 001 Issued at 2200Z on 01 JAN 1999IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z SOLAR ACTIVITY INCREASED TO MODERATE LEVELS BY VIRTUE
OF AN OPTICALLY UNCORRELATED M1 X-RAY FLARE AT 01/0031UT. REGION
8421 (N27W39) SHOWED A SLIGHT INCREASE IN AREA AND SPOT NUMBER. IT
REMAINED A LARGE, MAGNETICALLY COMPLEX REGION AND PRODUCED ISOLATED
C-CLASS SUBFLARES, ONE OF WHICH WAS A LONG-DURATION C3/SF THAT
PEAKED AT 01/1245UT. NONE OF TODAY'S FLARES PRODUCED SIGNIFICANT
RADIO EMISSION. ACTIVE SURGING WAS VISIBLE IN REGION 8419 (N28W95)
AS IT CROSSED THE WEST LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
AT MODERATE LEVELS WITH AN ISOLATED M-CLASS FLARE LIKELY FROM REGION
8421. THERE IS ALSO A CHANCE FOR A MAJOR FLARE FROM THIS REGION.
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 02 JAN to 04 JAN
| Class M | 70% | 70% | 70% |
| Class X | 20% | 20% | 20% |
| Proton | 15% | 15% | 15% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 01 JAN 167 Predicted 02 JAN-04 JAN 165/165/165 90 Day Mean 01 JAN 136
V. Geomagnetic A Indices
OBSERVED AFR/AP 31 DEC 003/003 ESTIMATED AFR/AP 01 JAN 003/003 PREDICTED AFR/AP 02 JAN-04 JAN 005/008-005/008-005/008
VI. Geomagnetic Activity Probabilities 02 JAN to 04 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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