Viewing archive of Monday, 23 February 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 Feb 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 054 Issued at 2200Z on 23 FEB 1998IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z SOLAR ACTIVITY WAS LOW. TWO OPTICALLY UNCORRELATED
C-CLASS X-RAY BURSTS OCCURRED. A WEAK TYPE IV RADIO SWEEP WAS
DETECTED AT 23/0017UT. BRIGHT LOOP STRUCTURES WERE VISIBLE ABOVE OLD
REGION 8156 (NOW A DAY BEYOND THE WEST LIMB) AROUND THE TIME OF THE
SWEEP, MAKING IT THE LIKELY SOURCE. REGION 8158 (S18W82) DISPLAYED
GRADUAL GROWTH AND PRODUCED A COUPLE SUBFLARES AS IT APPROACHED THE
WEST LIMB. NEWLY NUMBERED REGION 8164 (N18E14) EMERGED RAPIDLY
EARLY IN THE PERIOD, THEN STABILIZED AS A SMALL B-TYPE. NEW REGION
8165 (N27E53) WAS ALSO NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
REGIONS 8158 AND 8164 MAY PRODUCE C-CLASS FLARES.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX REACHED HIGH LEVELS LATE IN THE PERIOD.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS
EXPECTED TO INCREASE TO UNSETTLED LEVELS DURING THE PERIOD. THE
GREATER THAN 2 MEV ELECTRON FLUX IS EXPECTED TO GRADUALLY DECLINE TO
MODERATE TO NORMAL LEVELS.
III. Event Probabilities 24 FEB to 26 FEB
| Class M | 05% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 23 FEB 099 Predicted 24 FEB-26 FEB 098/096/094 90 Day Mean 23 FEB 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 FEB 004/006 ESTIMATED AFR/AP 23 FEB 008/008 PREDICTED AFR/AP 24 FEB-26 FEB 010/010-012/015-010/008
VI. Geomagnetic Activity Probabilities 24 FEB to 26 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 20% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 20% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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