Viewing archive of Friday, 31 August 2001

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 2001 Aug 31 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 243 Issued at 2200Z on 31 Aug 2001

IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z

Solar activity was moderate due to a single M-class event during the period. Region 9601 (N14E32) produced an M1/Sn event with an accompanying 270 sfu Tenflare and a Type II radio sweep (velocity est. 961 km/s). LASCO imagery does not show any signs of an earth-directed coronal mass ejection from this event. Region 9601 has continued to show growth over the period and is capable of producing a major flare at any time. Region 9591 (S20W39) has shown some signs of minor decay during the period. It continues to retain a beta-gamma-delta magnetic configuration and is still capable of producing an isolated major flare before it rotates over the western limb on September 04-05. There are only three other spotted regions on the disk at this time. None of which have produced any significant activity.
IB. Solar Activity Forecast
Solar activity is expected to be moderate to high. Region 9591 and 9601 are expected to continue to produce isolated M-class events and both are capable of producing a major flare during the forecast period.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic field was mostly quiet to unsettled with isolated active periods.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to active with recurrent coronal hole effects beginning on 01 September. Barring any earth-directed coronal mass ejections, conditions should return to mostly quiet to unsettled on 03 September.
III. Event Probabilities 01 Sep to 03 Sep
Class M80%80%80%
Class X25%25%25%
Proton25%25%25%
PCAFyellow
IV. Penticton 10.7 cm Flux
  Observed       31 Aug 189
  Predicted   01 Sep-03 Sep  190/190/190
  90 Day Mean        31 Aug 156
V. Geomagnetic A Indices
  Observed Afr/Ap 30 Aug  008/013
  Estimated     Afr/Ap 31 Aug  015/015
  Predicted    Afr/Ap 01 Sep-03 Sep  015/015-015/025-012/020
VI. Geomagnetic Activity Probabilities 01 Sep to 03 Sep
A. Middle Latitudes
Active25%25%20%
Minor storm10%10%05%
Major-severe storm01%01%01%
B. High Latitudes
Active30%30%25%
Minor storm15%15%10%
Major-severe storm01%01%01%

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