Viewing archive of Saturday, 12 August 2000
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 2000 Aug 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 225 Issued at 2200Z on 12 AUG 2000IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z SOLAR ACTIVITY WAS MODERATE. AN M1 XRAY FLARE AT 0956Z,
SEEN BY SOHO EIT TO BE JUST BEYOND THE SOUTHWEST LIMB, WAS THE
LARGEST EVENT OF THE DAY. NUMEROUS C-CLASS FLARES OCCURRED, WITH
REGIONS 9114 (N10W58) AND 9125 (N25E42) CONTRIBUTING THE MAJORITY.
TWO NEW REGIONS WERE NUMBERED: 9128 (N11E61) AND 9129 (S05E72).
REGION 9125 GREW SUBSTANTIALLY DURING THE PERIOD AS IT PRODUCED
FREQUENT FLARES.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE.
IIA. GEOPHYSICAL ACTIVITY SUMMARY 11/2100Z TO 12/2100Z:
THE GEOMAGNETIC FIELD REMAINED AT ACTIVE TO SEVERE STORM LEVELS. THE
STRONGEST DISTURBANCES OCCURRED DURING LOCAL NIGHTTIME HOURS, AS
ENHANCED SOLAR WIND CONDITIONS CONTINUED TO DRIVE THE ACTIVITY. THE
IMF IS STILL SOUTHWARD WITH A MAGNITUDE OF 10 NT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT MINOR TO MAJOR STORM LEVELS FOR THE NEXT 24 HOURS.
THE CURRENT STORM SHOULD SUBSIDE OVER TIME, YIELDING TO MORE NORMAL
CONDITIONS BY THE PERIOD'S END. EXPECT LOCAL NIGHTTIME HOURS TO BE
THE MOST AFFECTED.
III. Event Probabilities 13 AUG to 15 AUG
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 12 AUG 189 Predicted 13 AUG-15 AUG 195/200/205 90 Day Mean 12 AUG 190
V. Geomagnetic A Indices
OBSERVED AFR/AP 11 AUG 039/060 ESTIMATED AFR/AP 12 AUG 050/120 PREDICTED AFR/AP 13 AUG-15 AUG 030/060-020/030-015/030
VI. Geomagnetic Activity Probabilities 13 AUG to 15 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 50% |
| Minor storm | 30% | 50% | 20% |
| Major-severe storm | 40% | 15% | 10% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 40% |
| Minor storm | 20% | 30% | 30% |
| Major-severe storm | 60% | 40% | 20% |
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