Viewing archive of Sunday, 9 May 1999
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 1999 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 1999IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z SOLAR ACTIVITY WAS HIGH WITH AN M7 XRAY FLARE WHICH
OCCURRED AT 09/1807UT. THE PROBABLE REGION AND LOCATION ARE 8537
AND N19W88. ADDITIONALLY, AN M1/1F OCCURRED AT 09/0047UT FROM
REGION 8541 (N22E53) AND ANOTHER M1/SF AT 09/1227UT FROM REGION 8525
(N17W60).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE. ALTHOUGH REGION 8537 IS ROTATING OFF THE DISK, OTHER
ACTIVE REGIONS ARE EXPECTED KEEP ACTIVITY AT MODERATE LEVELS.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET. THE GREATER THAN 2 MEV
ELECTRONS AT GEOSYNCHRONOUS ORBIT WERE AT MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED THROUGH THE SECOND DAY OF THE
PERIOD. ON THE LAST DAY OF THE PERIOD, EFFECTS FROM A DISAPPEARING
FILAMENT ARE EXPECTED TO INCREASE ACTIVITY SLIGHTLY.
III. Event Probabilities 10 MAY to 12 MAY
| Class M | 75% | 75% | 60% |
| Class X | 20% | 20% | 15% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 09 MAY 178 Predicted 10 MAY-12 MAY 180/180/180 90 Day Mean 09 MAY 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 MAY 004/006 ESTIMATED AFR/AP 09 MAY 004/010 PREDICTED AFR/AP 10 MAY-12 MAY 008/005-008/008-010/010
VI. Geomagnetic Activity Probabilities 10 MAY to 12 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 30% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 35% |
| Minor storm | 15% | 15% | 20% |
| Major-severe storm | 01% | 01% | 05% |
All times in UTC
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