Viewing archive of Friday, 2 April 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 Apr 02 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 092 Issued at 2200Z on 02 APR 1999IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z SOLAR ACTIVITY WAS MODERATE. ONE OPTICALLY
UNCORRELATED M1 X-RAY EVENT OCCURRED AT 02/0821Z. MINOR GROWTH WAS
REPORTED IN REGION 8504 (S28E23). MINOR SURGING WAS OBSERVED AGAIN
TODAY ON THE NORTHEAST LIMB. NO NEW REGIONS WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
THE GEOMAGNETIC FIELD WAS PREDOMINANTLY QUIET TO UNSETTLED. HOWEVER,
ONE PERIOD OF ACTIVE CONDITIONS OCCURRED FROM 02/0300 - 0600Z. THIS
ACTIVITY IS BELIEVED TO BE RELATED TO A HIGH SPEED CORONAL HOLE
STREAM IMPACTING THE EARTH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET TO UNSETTLED. ISOLATED ACTIVE TO MINOR
STORM LEVELS ARE POSSIBLE DURING THE NEXT COUPLE DAYS DUE TO THE
CONTINUATION OF AN ELONGATED CORONAL HOLE IN THE SOLAR SOUTHWEST
QUADRANT.
III. Event Probabilities 03 APR to 05 APR
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 02 APR 100 Predicted 03 APR-05 APR 104/106/110 90 Day Mean 02 APR 135
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 APR 014/014 ESTIMATED AFR/AP 02 APR 014/014 PREDICTED AFR/AP 03 APR-05 APR 015/015-015/020-012/010
VI. Geomagnetic Activity Probabilities 03 APR to 05 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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