Viewing archive of Friday, 1 October 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 Oct 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 274 Issued at 2200Z on 01 OCT 1999IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z SOLAR ACTIVITY WAS LOW. EIGHT C-CLASS EVENTS WERE
RECORDED, THE LARGEST BEING A C7 FLARE AT 01/0017UT. ALL OF THE
C-CLASS FLARES WERE UNCORRELATED AND PROBABLY ORIGINATED FROM OVER
THE EAST LIMB. GROUND BASED OBSERVATORIES AND SPACECRAFT DATA SHOW
TWO DISTINCT ACTIVE AREAS ON THE EAST LIMB THAT SHOULD ROTATE ONTO
THE FACE IN A COUPLE OF DAYS. A TYPE II SWEEP (600 KM/S) OCCURRED AT
01/0816UT IN CONJUNCTION WITH A C3 X-RAY FLARE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
WITH AN ISOLATED CHANCE OF AN M-CLASS EVENT.
IIA. Geophysical Activity Summary 30-2100Z to 01-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT REMAINED AT MODERATE TO HIGH
LEVELS DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO ACTIVE FOR THE FORECAST PERIOD DUE THE
POSSIBLE GEOEFFECTIVE POSITION OF TWO CORONAL HOLES.
III. Event Probabilities 02 OCT to 04 OCT
| Class M | 10% | 15% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 01 OCT 122 Predicted 02 OCT-04 OCT 125/130/130 90 Day Mean 01 OCT 156
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 SEP 014/029 ESTIMATED AFR/AP 01 OCT 010/015 PREDICTED AFR/AP 02 OCT-04 OCT 020/025-015/020-015/020
VI. Geomagnetic Activity Probabilities 02 OCT to 04 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 50% | 40% | 40% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 60% | 50% | 50% |
| Minor storm | 30% | 25% | 25% |
| Major-severe storm | 01% | 01% | 01% |
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