Viewing archive of Monday, 22 February 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 Feb 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 053 Issued at 2200Z on 22 FEB 1999IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z SOAR ACTIVITY WAS LOW. A C3 X-RAY EVENT OCCURRED AT
22/1301UT AND A LONG DURATION (1.5 HOURS) C1 EVENT OCCURRED AT
22/2210UT. BOTH WERE OPTICALLY UNCORRELATED. THE DISK AND LIMBS WERE
MOSTLY QUIET AND STABLE. A NEW REGION, 8470 (S23E72), EMERGED AS A 5
SPOT BXO BETA GROUP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO CONTINUE
TO BE LOW.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET WITH A FEW ISOLATED UNSETTLED
PERIODS. THE GREATER THAN 2 MEV ELECTRONS WERE ABOVE THRESHOLD
LEVELS FOR THE ENTIRE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO VARY FROM QUIET TO ACTIVE LEVELS IN THE NEXT 24 HOURS. A
HIGH SPEED STREAM FROM A WELL POSITIONED CORONAL HOLE MAY AFFECT THE
NEAR EARTH ENVIRONS DURING THAT TIME. CONDITIONS SHOULD RETURN TO
QUIET TO UNSETTLED AFTER THAT.
III. Event Probabilities 23 FEB to 25 FEB
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 22 FEB 130 Predicted 23 FEB-25 FEB 125/120/118 90 Day Mean 22 FEB 146
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 FEB 003/005 ESTIMATED AFR/AP 22 FEB 007/012 PREDICTED AFR/AP 23 FEB-25 FEB 015/017-010/008-005/005
VI. Geomagnetic Activity Probabilities 23 FEB to 25 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 20% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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