Viewing archive of Thursday, 1 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 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 091 Issued at 2200Z on 01 APR 1999IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z SOLAR ACTIVITY WAS VERY LOW. THE REGIONS HAVE SHOWN NO
SIGNIFICANT CHANGE. SOME MINOR SURGING WAS OBSERVED DURING THE
PERIOD ON THE NORTHEAST LIMB. NO NEW REGIONS WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
VERY LOW WITH THE CHANCE OF AN ISOLATED C-CLASS XRAY EVENT.
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORM LEVELS. MINOR
STORM CONDITIONS WERE EXPERIENCED DURING THE 01/0000 - 0600Z
PERIODS. 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 PREDOMINANTLY QUIET TO UNSETTLED. ISOLATED ACTIVE TO
MINOR STORM LEVELS ARE POSSIBLE DURING THE NEXT THREE DAYS DUE TO
THE CONTINUATION OF AN ELONGATED CORONAL HOLE IN THE SOLAR SOUTHERN
HEMISPHERE.
III. Event Probabilities 02 APR to 04 APR
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 01 APR 103 Predicted 02 APR-04 APR 104/106/108 90 Day Mean 01 APR 135
V. Geomagnetic A Indices
OBSERVED AFR/AP 31 MAR 015/014 ESTIMATED AFR/AP 01 APR 016/015 PREDICTED AFR/AP 02 APR-04 APR 015/015-015/015-015/020
VI. Geomagnetic Activity Probabilities 02 APR to 04 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 35% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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