Viewing archive of Tuesday, 4 September 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 Sep 04 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 247 Issued at 2200Z on 04 Sep 2001

IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z

Solar activity was moderate. A gradual rise in X-rays began at around 04/1000Z and continued through the end of this period. Since 04/1500Z, the X-ray baseline ranged from C4 - C8 with occasional fluctuations to the M1 level. Development within regions near the SE limb, the SW limb and within Region 9601 (N13W22) are the likely sources of the enhanced X-rays. Region 9606 (S17E45) produced an impulsive M1/1n at 04/2017Z. Region 9601, at almost 800 millionths of white light area is moderately complex and the largest region on the visible disk. Several plage fluctuations were observed in this region, but only minor C-class flareS were observed. The two M-class flares observed yesterday at 03/1545Z and 03/1841Z were likely associated with CMEs off the SE limb. New region 9607 (S16E68) was numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at moderate to high levels. New regions near the SE limb and developing regions near the SW limb have potential for isolated M-class flares. Region 9601 also has potential for M-class flares.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic field was mostly at unsettled to active levels. A high speed coronal hole stream and possibly some weak CME effects are producing the disturbed conditions.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to return to quiet to unsettled conditions by the end of day one and persist through days two and three.
III. Event Probabilities 05 Sep to 07 Sep
Class M70%70%70%
Class X15%15%15%
Proton15%15%15%
PCAFyellow
IV. Penticton 10.7 cm Flux
  Observed       04 Sep 218
  Predicted   05 Sep-07 Sep  210/210/205
  90 Day Mean        04 Sep 158
V. Geomagnetic A Indices
  Observed Afr/Ap 03 Sep  012/017
  Estimated     Afr/Ap 04 Sep  015/018
  Predicted    Afr/Ap 05 Sep-07 Sep  010/012-010/010-010/010
VI. Geomagnetic Activity Probabilities 05 Sep to 07 Sep
A. Middle Latitudes
Active30%20%20%
Minor storm10%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active40%25%25%
Minor storm15%05%05%
Major-severe storm05%01%01%

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