Viewing archive of Monday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 298 Issued at 2200Z on 25 OCT 1999IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS MODERATE. AN M1/1B FLARE OCCURRED AT
25/0631UT FROM REGION 8741 (S25E22). REGION 8739 (S12E03) CONTINUED
TO GROW IN SIZE AND COMPLEXITY. THE LARGEST FLARE IN THIS REGION
SINCE YESTERDAY WAS A C2/SF AT 25/0740UT. NEW REGIONS 8743 (S15E20)
AND 8744 (N08E43) WERE NUMBERED. A LARGE FILAMENT NEAR S32W30 TO
S54E25 ERUPTED FROM ABOUT 25/1215-1351UT. SIGNIFICANT X-RAY OR RADIO
OUTPUT WAS NOT OBSERVED WITH THE ERUPTION. COMPLETE CME INFORMATION
FROM LASCO WAS NOT YET AVAILABLE AT THIS WRITING.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. THE LIKELIHOOD OF A MAJOR FLARE IN REGION 8739 IS
INCREASING WITH ITS CONTINUED DEVELOPMENT.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE. THE GREATER THAN 2
MEV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT WAS MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO CONTINUE AT UNSETTLED TO ACTIVE LEVELS.
III. Event Probabilities 26 OCT to 28 OCT
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 OCT 179 Predicted 26 OCT-28 OCT 170/170/170 90 Day Mean 25 OCT 158
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 OCT 020/023 ESTIMATED AFR/AP 25 OCT 020/020 PREDICTED AFR/AP 26 OCT-28 OCT 020/018-015/015-010/020
VI. Geomagnetic Activity Probabilities 26 OCT to 28 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 15% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 15% | 05% | 05% |
All times in UTC
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