Viewing archive of Friday, 24 April 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 Apr 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 114 Issued at 2200Z on 24 APR 1998IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z SOLAR ACTIVITY WAS LOW. AN UNCORRELATED C8 X-RAY BURST
WAS DETECTED AT 24/0852Z. THIS MAY HAVE BEEN ASSOCIATED WITH AN
ERUPTIVE PROMINENCE ON THE SE LIMB AT S34 WHICH BEGAN AT 24/0450Z.
THIS EPL ENDED AT 24/0940Z. THE REMAINDER OF THE VISIBLE DISK WAS
QUIET. NEW REGION 8210 (S19E70) WAS NUMBERED TODAY. THIS REGION WAS
THE SITE OF YESTERDAY'S CME ASSOCIATED WITH AN X1 FLARE, A LOOP
PROMINENCE SYSTEM AND NUMEROUS POINT BRIGHTENINGS. THE REGION
CONTAINS ONLY BRIGHT PLAGE AND ACTIVE SURGING AT THIS TIME, BUT
PRELIMINARY REPORTS OF SPOTS WERE RECEIVED LATE IN THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE AS REGION 8210 ROTATES ONTO THE VISIBLE DISK. THIS
REGION IS EXPECTED TO PRODUCE C-CLASS AND M-CLASS ACTIVITY DURING
ITS TRANSIT OF THE DISK, AS WELL AS ISOLATED X-CLASS ACTIVITY.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO MINOR STORM. ACTIVE TO MINOR STORM
CONDITIONS SET IN ABOUT 23/1900Z WITH THE ARRIVAL OF A SHOCK
RESULTING FROM THE CME REPORTED ON 21 APRIL. THIS ACTIVITY LASTED
UNTIL 24/1500Z WHEN THE FIELD FINALLY SETTLED DOWN. THE GREATER THAN
10 MEV PROTON EVENT ENDED AT 24/1550Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE FOR THE NEXT 18 HOURS, THEN QUIET
TO UNSETTLED FOR THE REMAINDER OF THE FORECAST PERIOD. HIGH LATITUDE
STATIONS MAY STILL EXPERIENCE ISOLATED PERIODS OF ACTIVE TO MINOR
STORM CONDITIONS FOR THE NEXT 18 HOURS.
III. Event Probabilities 25 APR to 27 APR
| Class M | 15% | 25% | 25% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 24 APR 091 Predicted 25 APR-27 APR 094/094/096 90 Day Mean 24 APR 104
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 APR 013/014 ESTIMATED AFR/AP 24 APR 027/032 PREDICTED AFR/AP 25 APR-27 APR 015/015-010/012-010/010
VI. Geomagnetic Activity Probabilities 25 APR to 27 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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