Viewing archive of Friday, 15 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 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 015 Issued at 2200Z on 15 JAN 1999IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8440 (N20E42)
CONTINUED AS THE DOMINANT ACTIVE REGION ON THE DISK AS IT PRODUCED
ANOTHER M-CLASS EVENT (M1/1F AT 0721Z), AS WELL AS NUMEROUS C-CLASS
FLARES. THE LARGEST C-CLASS EVENT WAS A C9/1B AT 1444Z. THE REGION
CONSISTS OF NEARLY 30 SPOTS, BRIGHT PLAGE, AND A POSSIBLE MIXED
POLARITY (DELTA) CONFIGURATION IN THE SOUTHERN PORTION OF THE
INTERMEDIATE SPOTS. REGION 8439 (S24E41) GENERATED A C3/1F AT 1314Z,
BUT LITTLE ELSE. IT HAS A SLIGHT DEGREE OF MAGNETIC COMPLEXITY AS
WELL AS APPROXIMATELY 25 SPOTS. ELSEWHERE, THE REMAINDER OF THE DISK
AND LIMBS WERE QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
MODERATE. CONTINUED M-CLASS FLARES ARE LIKELY FROM REGION 8440, AND
SHOULD FURTHER DEVELOPMENT OCCUR, REGION 8439.
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE AT MIDDLE LATITUDES, AND
UNSETTLED TO MINOR STORM AT HIGH LATITUDES. A HIGH-SPEED SOLAR WIND
STREAM HAS PROLONGED THE CME-RELATED DISTURBANCE THAT BEGAN ON 13
JANUARY. THE GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS
ORBIT REACHED HIGH LEVELS AT APPROXIMATELY 1500Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE PRIMARILY QUIET TO UNSETTLED THROUGHOUT THE PERIOD.
SUBSTORMS MAY BRING BRIEF ACTIVE LEVELS DURING LOCAL NIGHTTIMES OVER
THE NEXT 24 HOURS.
III. Event Probabilities 16 JAN to 18 JAN
| Class M | 75% | 75% | 75% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 15 JAN 143 Predicted 16 JAN-18 JAN 150/155/160 90 Day Mean 15 JAN 138
V. Geomagnetic A Indices
OBSERVED AFR/AP 14 JAN 017/026 ESTIMATED AFR/AP 15 JAN 015/015 PREDICTED AFR/AP 16 JAN-18 JAN 015/015-010/009-005/009
VI. Geomagnetic Activity Probabilities 16 JAN to 18 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 25% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 30% | 20% |
| Minor storm | 20% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
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