Viewing archive of Saturday, 2 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 02 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 275 Issued at 2200Z on 02 OCT 1999IA. Analysis of Solar Active Regions and Activity from 01-2100Z to 02-2100Z SOLAR ACTIVITY WAS LOW. NUMEROUS MINOR C-CLASS X-RAY
EVENTS OCCURRED WITH NO OPTICAL CORRELATION EXCEPT WITH A C3/SF
OBSERVED AT 02/1828Z FROM REGION 8716 (N21E70). THE LARGEST EVENT
WAS A C6 AT 02/0156Z. SURGING WAS OBSERVED FROM THE NORTHEAST AND
SOUTHEAST LIMB AS TWO ACTIVE REGIONS ARE STARTING TO ROTATE ONTO THE
DISK. NEW REGION 8716 (N21E70) WAS NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
WITH A SLIGHT CHANCE OF AN M-CLASS X-RAY EVENT MOST LIKELY OCCURRING
FROM ONE OF THE MORE ACTIVE REGIONS NEAR THE EAST LIMB.
IIA. Geophysical Activity Summary 01-2100Z to 02-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. THE GREATER THAN 2 MEV
ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT ALTERNATED BETWEEN MODERATE TO
HIGH LEVELS THROUGHOUT THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO ACTIVE DURING THE FIRST DAY OF THE PERIOD
THEN BECOMING MORE QUIET TO UNSETTLED. ISOLATED ACTIVE CONDITIONS
ARE MORE LIKELY TO OCCUR IN THE HIGHER LATITUDES DURING THE FIRST
DAY OF THE PERIOD.
III. Event Probabilities 03 OCT to 05 OCT
| Class M | 10% | 10% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 02 OCT 126 Predicted 03 OCT-05 OCT 130/135/135 90 Day Mean 02 OCT 155
V. Geomagnetic A Indices
OBSERVED AFR/AP 01 OCT 006/011 ESTIMATED AFR/AP 02 OCT 012/015 PREDICTED AFR/AP 03 OCT-05 OCT 010/015-008/015-008/012
VI. Geomagnetic Activity Probabilities 03 OCT to 05 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 25% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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