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 UTC
Prepared 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 2000

IA. 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 M30%30%30%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
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
Active20%30%50%
Minor storm30%50%20%
Major-severe storm40%15%10%
B. High Latitudes
Active10%20%40%
Minor storm20%30%30%
Major-severe storm60%40%20%

All times in UTC

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