Viewing archive of Thursday, 13 July 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 Jul 13 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 195 Issued at 2200Z on 13 JUL 2000

IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z

SOLAR ACTIVITY WAS HIGH. A TOTAL OF FIVE M1 X-RAY EVENTS OCCURRED DURING THE PERIOD. THREE OF THE EVENTS WERE PRODUCED BY REGION 9070 (N22W77), ONE CAME FROM REGION 9085 (N12E59), AND ONE WAS OPTICALLY UNCORRELATED. REGIONS 9070 AND 9077 (N17E03) HAVE MAINTAINED COMPLEX MAGNETIC DELTA CONFIGURATIONS. SIGNIFICANT GROWTH OCCURRED IN REGION 9085 AND THE REGION NOW HAS A BETA GAMMA MAGNETIC CONFIGURATION. NEW REGION 9086 (S10W40) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN AT MODERATE TO HIGH LEVELS. NUMEROUS MINOR M-CLASS EVENTS ARE EXPECTED FROM REGIONS 9070, 9077, OR 9085. ALSO, THERE IS A POSSIBILITY OF A MAJOR FLARE EVENT FROM ANY OF THE THREE REGIONS MENTIONED ABOVE.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO MAJOR STORM LEVELS. A SUDDEN IMPULSE OCCURRED AT 13/0954Z (30 NT, AS MEASURED BY THE BOULDER USGS MAGNETOMETER). THE SOLAR WIND VELOCITY JUMPED FROM 500 TO OVER 700 KM/S AROUND 13/0900Z MAJOR STORM LEVELS WERE OBSERVED FOLLOWING THE SHOCK ARRIVAL. ONE PERIOD OF SEVERE STORM CONDITIONS WAS OBSERVED IN THE HIGH LATITUDES FROM 13/1200-1500Z. THIS SHOCK IS PRESUMED TO BE RELATED TO CME'S OBSERVED ON 10-11 JULY. THE GREATER THAN 10 MEV PROTON FLUX AT GEOSYNCHRONOUS ORBIT WAS ENHANCED DURING PERIOD. A MODERATE (8.0 PERCENT) FORBUSH DECREASE STARTED AT APPROXIMATELY 13/1130Z AND IS STILL IN PROGRESS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO RANGE FROM QUIET TO ACTIVE WITH ISOLATED PERIODS OF MINOR STORM CONDITIONS POSSIBLE THE FIRST DAY. THE GEOMAGNETIC FIELD IS EXPECTED TO DIMINISH ON THE SECOND DAY AND BECOME QUIET TO UNSETTLED WITH ISOLATED PERIODS OF ACTIVE CONDITIONS THE REMAINDER OF THE PERIOD.
III. Event Probabilities 14 JUL to 16 JUL
Class M80%80%80%
Class X30%30%30%
Proton20%20%20%
PCAFYELLOW
IV. Penticton 10.7 cm Flux
  Observed       13 JUL 232
  Predicted   14 JUL-16 JUL  230/225/210
  90 Day Mean        13 JUL 183
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 JUL  012/012
ESTIMATED AFR/AP 13 JUL  030/030
PREDICTED AFR/AP 14 JUL-16 JUL  020/020-012/015-010/015
VI. Geomagnetic Activity Probabilities 14 JUL to 16 JUL
A. Middle Latitudes
Active60%30%25%
Minor storm25%15%10%
Major-severe storm10%05%05%
B. High Latitudes
Active50%35%30%
Minor storm35%25%15%
Major-severe storm10%10%05%

All times in UTC

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