Viewing archive of Thursday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 238 Issued at 2200Z on 26 AUG 1999IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY WAS LOW WITH ONLY C-CLASS EVENTS DURING
THE PERIOD. THE STRONGEST C-CLASS EVENT WAS AN OPTICALLY
UNCORRELATED C7 AT 26/0705Z. REGION 8674 (S25W03) HAD SIGNIFICANT
GROWTH IN THE NUMBER OF SPOTS THROUGHOUT THE REGION. REGIONS 8675
(N18E53) AND 8677 (N04E60) BOTH DISPLAYED MINOR GROWTH. NEW REGION
8679 (S34E58) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8673 (S19W08) OR 8674 IS CAPABLE OF PRODUCING
AN M-CLASS EVENT.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED WITH PERIODS OF ACTIVE
CONDITIONS IN THE HIGHER LATITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH THE POSSIBILITY OF ISOLATED
ACTIVE PERIODS.
III. Event Probabilities 27 AUG to 29 AUG
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 AUG 222 Predicted 27 AUG-29 AUG 220/215/215 90 Day Mean 26 AUG 166
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 AUG 008/008 ESTIMATED AFR/AP 26 AUG 010/015 PREDICTED AFR/AP 27 AUG-29 AUG 010/012-010/010-008/010
VI. Geomagnetic Activity Probabilities 27 AUG to 29 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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