Viewing archive of Thursday, 27 April 2006

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 2006 Apr 27 2203 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 117 Issued at 2200Z on 27 Apr 2006

IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z

Solar activity was high. Region 875 (S11E20) produced an M7/1N flare at 27/1552 UTC. The flare was highly impulsive; no associated radio sweeps were observed and no proton events are expected.
IB. Solar Activity Forecast
Solar activity is expected to be low to moderate. Further M-class flares are possible from Region 875.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic field has been quiet to unsettled.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to unsettled.
III. Event Probabilities 28 Apr to 30 Apr
Class M30%30%30%
Class X05%05%05%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       27 Apr 101
  Predicted   28 Apr-30 Apr  100/100/100
  90 Day Mean        27 Apr 080
V. Geomagnetic A Indices
  Observed Afr/Ap 26 Apr  002/005
  Estimated     Afr/Ap 27 Apr  004/005
  Predicted    Afr/Ap 28 Apr-30 Apr  003/005-003/005-003/005
VI. Geomagnetic Activity Probabilities 28 Apr to 30 Apr
A. Middle Latitudes
Active10%10%10%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm05%05%05%
Major-severe storm01%01%01%

All times in UTC

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