Viewing archive of Wednesday, 25 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 25 2203 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 115 Issued at 2200Z on 25 Apr 2007

IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z

Solar activity increased to low levels. Newly numbered Region 953 (S14E73) has partially rotated into view during the period and produced a C2 x-ray flare at 25/2256Z. A four spot Hsx alpha sunspot group is currently visible in white light.
IB. Solar Activity Forecast
Solar activity is expected to be at very low to low levels.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was at quiet to unsettled levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on 26 and 27 April. A recurrent coronal hole high speed stream is expected to become geoeffective on 29 April. Active to minor storm conditions are expected with the onset of the coronal hole.
III. Event Probabilities 26 Apr to 28 Apr
Class M05%10%10%
Class X01%01%01%
Proton01%01%01%
PCAFGreen
IV. Penticton 10.7 cm Flux
  Observed       25 Apr 077
  Predicted   26 Apr-28 Apr  080/080/080
  90 Day Mean        25 Apr 074
V. Geomagnetic A Indices
  Observed Afr/Ap 24 Apr  005/004
  Estimated     Afr/Ap 25 Apr  005/005
  Predicted    Afr/Ap 26 Apr-28 Apr  005/005-005/005-015/025
VI. Geomagnetic Activity Probabilities 26 Apr to 28 Apr
A. Middle Latitudes
Active10%10%30%
Minor storm01%01%15%
Major-severe storm01%01%10%
B. High Latitudes
Active10%10%45%
Minor storm05%05%20%
Major-severe storm01%01%15%

All times in UTC

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