Viewing archive of Thursday, 30 September 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 Sep 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 273 Issued at 2200Z on 30 SEP 1999IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z SOLAR ACTIVITY WAS LOW. ONE MINOR C-CLASS EVENT
OCCURRED AT 30/0507Z WITH NO OPTICAL CORRELATION. NEW REGION 8715
(N11E42) WAS NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORM CONDITIONS DUE
TO A HIGH SPEED CORONAL HOLE STREAM IMPACTING THE EARTH. THE
GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT DROPPED
BELOW HIGH LEVELS BUT REMAINED ENHANCED DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO ACTIVE. ISOLATED MINOR STORM CONDITIONS ARE
POSSIBLE IN THE HIGHER LATITUDES DURING THE FIRST DAY OF THE PERIOD.
III. Event Probabilities 01 OCT to 03 OCT
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 30 SEP 125 Predicted 01 OCT-03 OCT 122/125/125 90 Day Mean 30 SEP 157
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 SEP 022/019 ESTIMATED AFR/AP 30 SEP 024/025 PREDICTED AFR/AP 01 OCT-03 OCT 014/020-010/015-008/015
VI. Geomagnetic Activity Probabilities 01 OCT to 03 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 20% | 20% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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