Viewing archive of Sunday, 12 April 2009

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 2009 Apr 12 2201 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 102 Issued at 2200Z on 12 Apr 2009

IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z

Solar activity was very low. No flares were observed during the past 24 hours. The visible disk remained spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field was predominantly quiet. A single period of unsettled conditions was observed at mid-latitudes between 12/0600-0900Z. Solar wind velocities measured at ACE gradually declined from 563 to 458 km/s as effects from the coronal hole high-speed stream wane. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet for the next three days (13-15 April).
III. Event Probabilities 13 Apr to 15 Apr
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFGreen
IV. Penticton 10.7 cm Flux
  Observed       12 Apr 069
  Predicted   13 Apr-15 Apr  070/070/070
  90 Day Mean        12 Apr 070
V. Geomagnetic A Indices
  Observed Afr/Ap 11 Apr  007/009
  Estimated     Afr/Ap 12 Apr  005/007
  Predicted    Afr/Ap 13 Apr-15 Apr  005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 13 Apr to 15 Apr
A. Middle Latitudes
Active05%05%05%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active05%05%05%
Minor storm01%01%01%
Major-severe storm01%01%01%

All times in UTC

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