Viewing archive of Saturday, 28 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 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 332 Issued at 2200Z on 28 NOV 1998IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z SOLAR ACTIVITY BECAME HIGH. REGION 8395 (N20E33)
PRODUCED A X3/3N AT 28/0552Z. THIS EVENT HAD TYPE II/IV SWEEPS AND
MODERATE CENTIMETRIC RADIO BURST INCLUDING 3600 SFU'S AT 2695 MHZ. A
PARTIAL-HALO CME WAS ALSO ASSOCIATED WITH THIS FLARE. OBSERVATORIES
REPORTED SOME SPOT GROWTH PRIOR TO THE FLARE. REGION 8395 IS NOW A
MODERATELY COMPLEX F-TYPE GROUP WITH A BETA-GAMMA MAGNETIC
CONFIGURATION. IT PRODUCED A FEW SUBFLARES SHORTLY AFTER THE X3/3N,
BUT HAS BEEN MOSTLY STABLE SINCE 28/1400Z. REGION 8393 (S18E12)
DISPLAYED A BIT OF MAGNETIC COMPLEXITY, BUT WAS STABLE DURING THE
PERIOD. THE REMAINING REGIONS WERE STABLE. NO NEW REGIONS WERE
NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE. REGION 8395 HAS MAINTAINED A LARGE FIELD OF NEAR FLARE
INTENSITY PLAGE SINCE THE X-FLARE TODAY. FREQUENT SUBFLARES,
FLUCTUATIONS, AND SURGES ALSO SUGGEST THE POSSIBILITY OF ANOTHER
MAJOR FLARE. REGION 8393 MAY PRODUCE C-CLASS ACTIVITY WITH A SMALL
CHANCE OF AN M-CLASS FLARE.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET THROUGH DAY 1. A MINOR DISTURBANCE FROM THE
M1/2N FLARE EARLY ON THE 27TH MAY CAUSE ACTIVE CONDITIONS ON DAY 2
AND 3.
III. Event Probabilities 29 NOV to 01 DEC
| Class M | 70% | 70% | 70% |
| Class X | 20% | 20% | 20% |
| Proton | 20% | 20% | 20% |
| PCAF | YELLOW | ||
IV. Penticton 10.7 cm Flux
Observed 28 NOV 165 Predicted 29 NOV-01 DEC 165/165/170 90 Day Mean 28 NOV 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 27 NOV 008/008 ESTIMATED AFR/AP 28 NOV 005/010 PREDICTED AFR/AP 29 NOV-01 DEC 005/010-015/018-012/010
VI. Geomagnetic Activity Probabilities 29 NOV to 01 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 30% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 35% | 35% |
| Minor storm | 01% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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