Viewing archive of Tuesday, 5 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 05 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 278 Issued at 2200Z on 05 OCT 1999IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z SOLAR ACTIVITY REMAINED LOW. REGION 8720 (N13E43)
PRODUCED A C2/SF AT 05/0551Z. THE DISK IS CHARACTERIZED BY MANY
SMALL MOSTLY BIPOLAR AND MOSTLY STABLE REGIONS. ONLY REGION 8722
(N15E09) EXHIBITED MODERATE GROWTH BUT REMAINED A MINOR REGION. A
SMALL H CLASS SPOT ROTATED AROUND THE LIMB NEAR S24E68 AND WAS
NUMBERED AS REGION 8725.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD REMAIN
PREDOMINANTLY LOW. THERE IS A SMALL AND DECREASING POSSIBILITY OF A
LOW LEVEL M-CLASS FLARE DURING THE PERIOD.
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
THE GEOMAGNETIC FIELD WAS PREDOMINANTLY UNSETTLED TO ACTIVE. SOLAR
WIND VELOCITY CONTINUED TO SLOWLY INCREASE AND AT THE END OF THE
PERIOD WAS OVER 550 KM/S.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD
REMAIN AT UNSETTLED TO ACTIVE LEVELS FOR THE NEXT THREE DAYS.
ISOLATED MINOR STORMING IS POSSIBLE. THIS DISTURBANCE IS BELIEVED TO
BE RELATED TO AN EXTENDED CORONAL HOLE IN THE NORTHERN HEMISPHERE OF
THE SUN. DUE TO THE WIDTH OF THIS FEATURE, DISTURBED CONDITIONS ARE
EXPECTED FOR THE NEXT SEVEN DAYS.
III. Event Probabilities 06 OCT to 08 OCT
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 05 OCT 146 Predicted 06 OCT-08 OCT 148/150/154 90 Day Mean 05 OCT 155
V. Geomagnetic A Indices
OBSERVED AFR/AP 04 OCT 009/015 ESTIMATED AFR/AP 05 OCT 014/015 PREDICTED AFR/AP 06 OCT-08 OCT 015/015-015/010-015/010
VI. Geomagnetic Activity Probabilities 06 OCT to 08 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 40% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 40% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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