Viewing archive of Thursday, 14 September 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 Sep 14 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 258 Issued at 2200Z on 14 SEP 2000

IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z

SOLAR ACTIVITY BECAME MODERATE. NEWLY NUMBERED REGION 9166 (S13E71) PRODUCED AN M1 X-RAY FLARE AT 14/0627Z. LIMB PROXIMITY IS INHIBITING A THOROUGH ANALYSIS OF THIS REGION, BUT FREQUENT SURGING AND POINT BRIGHTENINGS SUGGEST A MODERATELY COMPLEX REGION ROTATING INTO VIEW. REGION 9165 (N13E13) DEVELOPED RAPIDLY IN THE PAST 24 HOURS. FROM A SIMPLE SMALL THREE SPOT BETA CONFIGURATION YESTERDAY, THIS REGION EVOLVED INTO A BETA-GAMMA SPOT GROUP WITH OVER 20 SPOTS COVERING NEARLY 300 MILLIONTHS OF WHITE LIGHT AREA. SEVERAL SMALL C-CLASS FLARES WERE OBSERVED IN THIS REGION. SLIGHT GROWTH WAS ALSO NOTED IN REGIONS 9156 (S26W53), AND 9162 (S32W63).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. M-CLASS ACTIVITY IS BECOMING MORE LIKELY WITH THE EMERGENCE OF REGION 9165, AND NEW REGION 9166. IIA. GEOPHYSICAL ACTIVITY SUMMARY 13/2100Z TO 14/2100Z: THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED. THE >10 MEV PROTON EVENT THAT BEGAN AT 12/1555Z IS STILL IN PROGRESS. A MAXIMUM VALUE OF 321 PFU OCCURRED AT 13/0340Z. THE EVENT HAS BEEN IN SLOW DECAY SINCE THE MAXIMUM AND IS CURRENTLY AT 18 PFU. THE PCA THAT BEGAN NEAR 12/1830Z, ENDED AT 14/1532Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO SOON EXPERIENCE MINOR TO MAJOR STORM CONDITIONS. A CME ASSOCIATED WITH THE 12 SEP, M1/2N FLARE WILL LIKELY IMPACT EARLY ON DAY ONE. STORM CONDITIONS SHOULD PERSIST FOR MOST OF DAY ONE AND RETURN TO UNSETTLED CONDITIONS BY DAYS TWO AND THREE. THE >10 MEV PROTON EVENT SHOULD END ON DAY ONE, ALTHOUGH AN ENHANCEMENT IS POSSIBLE WITH THE PASSAGE OF THE EXPECTED CME.
III. Event Probabilities 15 SEP to 17 SEP
Class M10%10%15%
Class X01%01%05%
Proton99%30%05%
PCAFIN PROGRESS
IV. Penticton 10.7 cm Flux
  Observed       14 SEP 151
  Predicted   15 SEP-17 SEP  155/160/170
  90 Day Mean        14 SEP 177
V. Geomagnetic A Indices
OBSERVED AFR/AP 13 SEP  008/010
ESTIMATED AFR/AP 14 SEP  010/013
PREDICTED AFR/AP 15 SEP-17 SEP  050/045-015/012-008/012
VI. Geomagnetic Activity Probabilities 15 SEP to 17 SEP
A. Middle Latitudes
Active20%35%20%
Minor storm40%30%10%
Major-severe storm40%20%05%
B. High Latitudes
Active10%40%25%
Minor storm45%40%15%
Major-severe storm45%20%10%
COMMENTS EFFECTIVE 2 0CT 2000, SEC WILL ISSUE ITS TEXT PRODUCTS IN MIXED CASES VS. ALL UPPER CASE. THIS CHANGE WILL BE VISIBLE ON ALL SEC PRODUCT DELIVERY SYSTEMS EXCEPT FOR TELETYPE CIRCUITS. ONLY THE CASE OF THE TEXT IN EACH PRODUCT WILL CHANGE, NOT THE FORMAT OR SPACING WITHIN THE PRODUCT. FOR DETAILS SEE OUR WEB SITE AT SEC.NOAA.GOV/MIXEDCASE.HTML

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