Viewing archive of Friday, 1 September 2000
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 2000 Sep 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 245 Issued at 2200Z on 01 SEP 2000IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z SOLAR ACTIVITY WAS LOW. REGION 9140 (N11W67) PRODUCED
TODAY'S LARGEST EVENT, A C9/1N AT 1820Z WHICH WAS ACCOMPANIED BY A
TYPE II SWEEP. AN ASSOCIATED CME WAS OBSERVED OVER THE SOUTHWEST
LIMB IN THE LASCO C2 FIELD OF VIEW, BEGINNING AT 1854Z. REGION 9140
APPEARS TO BE DECLINING. REGION 9143 (S18W32) ALSO SEEMS TO BE ON
THE DECLINE, BUT DID MANAGE TO PRODUCE A C1/SF AT 0606Z. REGION 9149
(N14E18), THE LARGEST GROUP ON THE DISK, CONTINUES TO GROW SLOWLY,
BUT REMAINS VERY STABLE. TWO NEW, SMALL ACTIVE REGIONS WERE ASSIGNED
DURING THE PAST 24 HOURS: 9153 (S33E16) AND 9154 (S21E44).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MOSTLY LOW, BUT THERE CONTINUES TO BE A SLIGHT-TO-FAIR CHANCE FOR AN
ISOLATED M-CLASS EVENT DURING THE NEXT THREE DAYS.
IIA. GEOPHYSICAL ACTIVITY SUMMARY 31/2100Z TO 01/2100Z:
THE GEOMAGNETIC FIELD WAS UNSETTLED TO ACTIVE. THE ENHANCED ACTIVITY
LEVELS CONTINUE AS A CONSEQUENCE OF THE ONGOING, BUT WEAKENING
HIGH-SPEED CORONAL HOLE SOLAR WIND STREAM. THE GREATER THAN 2 MEV
ELECTRON FLUX LEVELS AT GEOSYNCHRONOUS ALTITUDE CONTINUE TO BE HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED DURING THE NEXT 24 HOURS, ALTHOUGH
THERE IS A CHANCE FOR AN ISOLATED ACTIVE PERIOD. MOSTLY UNSETTLED
CONDITIONS SHOULD PREVAIL DURING THE SECOND AND THIRD DAYS OF THE
FORECAST PERIOD.
III. Event Probabilities 02 SEP to 04 SEP
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 01 SEP 158 Predicted 02 SEP-04 SEP 155/155/155 90 Day Mean 01 SEP 181
V. Geomagnetic A Indices
OBSERVED AFR/AP 31 AUG 012/015 ESTIMATED AFR/AP 01 SEP 015/018 PREDICTED AFR/AP 02 SEP-04 SEP 012/012-010/010-010/010
VI. Geomagnetic Activity Probabilities 02 SEP to 04 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 25% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 20% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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