Viewing archive of Wednesday, 25 August 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 Aug 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 237 Issued at 2200Z on 25 AUG 1999IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8674 (S24E11)
PRODUCED AN M3/1N EVENT AT 25/0136Z WITH AN ASSOCIATED TYPE II SWEEP
AND A 310 SFU 10CM RADIO BURST. THE TYPE II HAD AN ESTIMATED SPEED
OF 500 KM/S. REGION 8674 ALSO PRODUCED A C6/SF AT 25/1504Z.
SEVERAL OTHER OPTICALLY UNCORRELATED MINOR C-CLASS EVENTS OCCURRED
DURING THE PERIOD. REGION 8676 (N26E61) DISPLAYED SLIGHT GROWTH
SINCE YESTERDAY. NEW REGIONS 8677 (N07E71) AND REGION 8678 (N16W40)
WERE NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8674 IS STILL THE MOST LIKELY TO PRODUCE AN
M-CLASS EVENT.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH THE POSSIBILITY OF ISOLATED
ACTIVE PERIODS.
III. Event Probabilities 26 AUG to 28 AUG
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 AUG 208 Predicted 26 AUG-28 AUG 215/220/220 90 Day Mean 25 AUG 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 AUG 018/029 ESTIMATED AFR/AP 25 AUG 008/006 PREDICTED AFR/AP 26 AUG-28 AUG 015/015-010/012-010/010
VI. Geomagnetic Activity Probabilities 26 AUG to 28 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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