Viewing archive of Sunday, 22 November 1998
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 1998 Nov 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 326 Issued at 2200Z on 22 NOV 1998IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z SOLAR ACTIVITY INCREASED TO HIGH LEVELS. REGION 8384
(S26W88) PRODUCED TWO X-CLASS FLARES AS IT CROSSED THE WEST LIMB.
THE FIRST WAS AN X3/1N AT 22/0642UT WITH AN ASSOCIATED 340 SFU
TENFLARE, A SIGNIFICANT TYPE II RADIO SWEEP, A MINOR TYPE IV RADIO
SWEEP AND MODERATE DISCRETE RADIO BURSTS. THE SECOND FLARE WAS AN
X2/2N AT 22/1623UT WITH AN ASSOCIATED LOOP PROMINENCE SYSTEM AND
MODERATE DISCRETE RADIO BURSTS. THIS SUDDEN INCREASE TO HIGH LEVELS
WAS SURPRISING GIVEN THE STABILITY EXHIBITED BY REGION 8384 DURING
RECENT DAYS. A OPTICALLY UNCORRELATED M1 X-RAY FLARE OCCURRED AT
22/1839UT. THE REMAINING REGIONS APPEARED STABLE. NO NEW REGIONS
WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE AT
MODERATE TO HIGH LEVELS DURING THE FIRST DAY. REGION 8384 APPEARS
CAPABLE OF ADDITIONAL MAJOR FLARE ACTIVITY AS IT CONTINUES TO ROTATE
OUT OF VIEW. ACTIVITY IS EXPECTED TO DECLINE TO LOW TO MODERATE
LEVELS DURING THE REST OF THE PERIOD.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS. A SOLAR
PROTON FLUX ENHANCEMENT WAS DETECTED AT GEOSYNCHONOUS ALTITUDE
FOLLOWING TODAY'S X3/1N FLARE. THE GT 100 MEV PROTON FLUX BECAME
ENHANCED AROUND 22/0700UT, THEN RETURNED TO BACKGROUND LEVELS BY
22/1200UT. THE GT 10 MEV PROTON FLUX BECAME ENHANCED AROUND
22/0800UT AND WAS GRADUALLY DECLINING TOWARD BACKGROUND LEVELS AT
THE END OF THE REPORTING PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE THROUGHOUT THE PERIOD. THE GT 10
MEV PROTON FLUX ENHANCEMENT IS EXPECTED TO RETURN TO BACKGROUND
LEVELS DURING THE FIRST DAY, BARRING ANOTHER PROTON FLARE FROM
REGION 8384.
III. Event Probabilities 23 NOV to 25 NOV
| Class M | 70% | 50% | 30% |
| Class X | 30% | 05% | 01% |
| Proton | 20% | 10% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 22 NOV 126 Predicted 23 NOV-25 NOV 120/120/125 90 Day Mean 22 NOV 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 NOV 004/007 ESTIMATED AFR/AP 22 NOV 009/010 PREDICTED AFR/AP 23 NOV-25 NOV 012/009-015/009-015/009
VI. Geomagnetic Activity Probabilities 23 NOV to 25 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 30% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 40% | 40% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 05% | 05% |
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