Viewing archive of Tuesday, 24 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 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 236 Issued at 2200Z on 24 AUG 1999IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z SOLAR ACTIVITY WAS LOW. REGION 8674 (S26E24) PRODUCED
A C5/1F EVENT AT 24/0623Z AND A C2/1F AT 24/1716Z. SEVERAL OTHER
MINOR C-CLASS EVENTS OCCURRED WITH NO OPTICAL CORRELATION. NEW
REGIONS 8675 (N21E75) AND 8676 (N26E72) WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8674 APPEARS THE MOST CAPABLE FOR PRODUCING AN
M-CLASS EVENT.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
THE GEOMAGNETIC FIELD RANGED FROM PREDOMINANTLY UNSETTLED TO ACTIVE
WITH ONE PERIOD OF MINOR STORM CONDITIONS FROM 24/1200-1500Z. SINCE
THERE IS NO READILY DISCERNABLE SINGLE SOURCE, SEVERAL FACTORS MAY
HAVE COMBINED TO CAUSE THE INCREASED LEVEL IN GEOMAGNETIC ACTIVITY
DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE DURING THE FIRST HALF OF THE
PERIOD, BECOMING MORE QUIET TO UNSETTLED WITH ISOLATED PERIODS OF
ACTIVE CONDITIONS POSSIBLE IN THE SECOND HALF OF THE PERIOD.
III. Event Probabilities 25 AUG to 27 AUG
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 24 AUG 202 Predicted 25 AUG-27 AUG 208/215/220 90 Day Mean 24 AUG 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 AUG 022/033 ESTIMATED AFR/AP 24 AUG 024/033 PREDICTED AFR/AP 25 AUG-27 AUG 015/015-015/020-010/015
VI. Geomagnetic Activity Probabilities 25 AUG to 27 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 20% |
| Minor storm | 20% | 20% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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