Viewing archive of Saturday, 8 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 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 128 Issued at 2200Z on 08 MAY 1999IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z SOLAR ACTIVITY WAS MODERATE. TWO XRAY FLARES, AN M1
AND AN M4, OCCURRED FROM REGIONS 8541 (N22E67) AND 8526 (N19W80),
RESPECTIVELY. A TYPE II AND TYPE IV SWEEP WERE RECORDED DURING THE
M4 FLARE. THE TYPE II SWEEP WAS WEAK WITH A SHOCK SPEED OF
APPROXIMATELY 800 KM/S AND THE TYPE IV SWEEP LASTED FOR 49 MINUTES.
ONE NEW REGION, 8541 (N22E67), WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. 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.
III. Event Probabilities 09 MAY to 11 MAY
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 08 MAY 172 Predicted 09 MAY-11 MAY 180/190/180 90 Day Mean 08 MAY 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 07 MAY 009/009 ESTIMATED AFR/AP 08 MAY 006/010 PREDICTED AFR/AP 09 MAY-11 MAY 005/010-008/005-008/008
VI. Geomagnetic Activity Probabilities 09 MAY to 11 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
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