Viewing archive of Friday, 20 April 2007

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 2007 Apr 20 2203 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 110 Issued at 2200Z on 20 Apr 2007

IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z

Solar activity was very low. The visible disk remains spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to range from quiet to active for the next three days due to a recurrent coronal hole high speed stream. Isolated active periods are possible at high latitudes on 21 April.
III. Event Probabilities 21 Apr to 23 Apr
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFGreen
IV. Penticton 10.7 cm Flux
  Observed       20 Apr 069
  Predicted   21 Apr-23 Apr  070/070/070
  90 Day Mean        20 Apr 075
V. Geomagnetic A Indices
  Observed Afr/Ap 19 Apr  004/006
  Estimated     Afr/Ap 20 Apr  005/008
  Predicted    Afr/Ap 21 Apr-23 Apr  012/015-008/008-008/008
VI. Geomagnetic Activity Probabilities 21 Apr to 23 Apr
A. Middle Latitudes
Active35%25%25%
Minor storm15%10%10%
Major-severe storm05%01%01%
B. High Latitudes
Active40%30%30%
Minor storm25%15%15%
Major-severe storm10%05%05%

All times in UTC

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