Viewing archive of Saturday, 9 May 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 May 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 129 Issued at 2200Z on 09 MAY 1998IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z SOLAR ACTIVITY INCREASED TO HIGH LEVELS. AN M7 X-RAY
FLARE WAS DETECTED AT 09/0340UT. A MAJOR TYPE IV RADIO SWEEP, A 210
SFU TENFLARE, AND A CORONAL MASS EJECTION (CME) ACCOMPANIED THE
FLARE. THE CME WAS NOT EARTH-DIRECTED. OLD REGION 8210, NOW A DAY
AND A HALF BEYOND THE WEST LIMB, WAS THE LIKELY SOURCE OF THE FLARE.
REGION 8214 (N27W74) PRODUCED ISOLATED C-CLASS FLARES AND SHOWED
LITTLE CHANGE IN SIZE OR SPOT NUMBER, BUT ANALYSIS WAS DIFFICULT DUE
TO LIMB PROXIMITY. REGION 8218 (S19W34) WAS STABLE. REGION 8213
(S22W89) PRODUCED AN ERUPTIVE PROMINENCE (VERTICAL EXTENT 0.3 SOLAR
RADII) AS IT CROSSED THE WEST LIMB. NO NEW REGIONS WERE ASSIGNED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE. REGIONS 8214 AND 8218 PROVIDE A FAIR CHANCE FOR ISOLATED
M-CLASS ACTIVITY.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. A GREATER THAN 10 MEV
PROTON ENHANCEMENT FOLLOWED THE M7 FLARE. IT BEGAN NEAR 09/0600UT
AND GRADUALLY INCREASED THROUGH THE PERIOD. FLUXES WERE NEAR EVENT
THRESHOLD AT THE END OF THE PERIOD. THE GREATER THAN 2 MEV ELECTRON
FLUX WAS AT MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED THROUGH THE PERIOD. THE GREATER THAN
10 MEV PROTON FLUX WILL LIKELY REACH EVENT THRESHOLD EARLY IN THE
PERIOD, THEN GRADUALLY DECLINE TO BACKGROUND LEVEL.
III. Event Probabilities 10 MAY to 12 MAY
| Class M | 50% | 40% | 20% |
| Class X | 05% | 05% | 01% |
| Proton | 05% | 05% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 09 MAY 111 Predicted 10 MAY-12 MAY 110/104/100 90 Day Mean 09 MAY 107
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 MAY 024/020 ESTIMATED AFR/AP 09 MAY 010/015 PREDICTED AFR/AP 10 MAY-12 MAY 010/010-012/010-012/010
VI. Geomagnetic Activity Probabilities 10 MAY to 12 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 30% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 35% | 35% |
| Minor storm | 10% | 20% | 20% |
| Major-severe storm | 01% | 01% | 01% |
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