Viewing archive of Friday, 20 March 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 Mar 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 079 Issued at 2200Z on 20 MAR 1998IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z SOLAR ACTIVITY WAS LOW. REGION 8179 (S22W69) PRODUCED
TWO C-CLASS FLARES, A C2.8/SF AT 20/1857Z AND A C1/SF AT 20/2030Z,
PLUS A FEW VERY MINOR SUBFAINT FLARES. SEVEN UNCORRELATED C-CLASS
X-RAY BURSTS WERE DETECTED AS WELL. THESE MAY HAVE ORIGINATED JUST
BEHIND THE SE LIMB (S26) WHERE AN ACTIVE SURGE REGION WAS VISIBLE
MOST OF THE DAY AND AN ERUPTIVE PROMINENCE WAS OBSERVED ENDING AT
20/1234Z. THIS IS LIKELY THE RETURN OF REGION 8171 (S24L235), BUT NO
SPOTS HAVE APPEARED ON THE LIMB YET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8179, STILL GROWING SLOWLY, HAS A GOOD CHANCE OF
C-CLASS ACTIVITY, A FAIR CHANCE OF ISOLATED M-CLASS ACTIVITY AND A
SMALL CHANCE OF PRODUCING AN ISOLATED X-CLASS EVENT.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED. THE GREATER THAN
TWO MEV ENERGETIC ELECTRON FLUX RANGED FROM MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE ENTIRE FORECAST PERIOD.
III. Event Probabilities 21 MAR to 23 MAR
| Class M | 45% | 45% | 25% |
| Class X | 10% | 10% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 20 MAR 127 Predicted 21 MAR-23 MAR 125/118/116 90 Day Mean 20 MAR 098
V. Geomagnetic A Indices
OBSERVED AFR/AP 19 MAR 003/004 ESTIMATED AFR/AP 20 MAR 007/008 PREDICTED AFR/AP 21 MAR-23 MAR 005/012-005/010-005/005
VI. Geomagnetic Activity Probabilities 21 MAR to 23 MAR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
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