Viewing archive of Tuesday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 299 Issued at 2200Z on 26 OCT 1999IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8739 (S11W10)
PRODUCED THE LARGEST FLARE OF THE PAST DAY, AN M2/1N AT 26/1852UT.
THIS REGION CONTINUES TO DEVELOP AND NOW HAS AN OVERALL SUNSPOT AREA
OF ABOUT 800+ MILLIONTHS, INCLUDING MIXED POLARITIES AND A MAGNETIC
DELTA CONFIGURATION. REGION 8739 ALSO GENERATED SEVERAL C-CLASS
FLARES. REGIONS 8737 (S15W78) AND 8741 (S25E09) ALSO PRODUCED
C-CLASS ACTIVITY. NEW REGION 8745 (S14E66) IS ROTATING AROUND THE
EAST LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS ACTIVITY IS EXPECTED FROM REGIONS 8737, 8739,
AND 8741. A MAJOR FLARE IN REGION 8739 IS POSSIBLE.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT WAS HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED. ACTIVITY LEVELS MAY BE INFLUENCED
BY A HIGH-SPEED CORONAL HOLE STREAM TOWARDS THE END OF THE FORECAST
PERIOD.
III. Event Probabilities 27 OCT to 29 OCT
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 OCT 189 Predicted 27 OCT-29 OCT 190/190/185 90 Day Mean 26 OCT 158
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 OCT 010/018 ESTIMATED AFR/AP 26 OCT 012/012 PREDICTED AFR/AP 27 OCT-29 OCT 010/015-015/015-015/025
VI. Geomagnetic Activity Probabilities 27 OCT to 29 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 02% | 02% | 02% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 02% | 02% | 02% |
All times in UTC
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