Viewing archive of Tuesday, 8 April 2008

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 2008 Apr 08 2203 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 099 Issued at 2200Z on 08 Apr 2008

IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z

Solar activity was very low. A non Earth-directed CME was first observed off the west limb on SOHO/LASCO C2 imagery at 08/1750Z. No new regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
The geomagnetic field was quiet to unsettled. Solar wind velocities remained elevated due to the continuing high speed stream. Velocities from the ACE satellite ranged from 604 km/sec to 778 km/sec during the past 24 hours. IMF Bz continued to fluctuate between -4.9 nT to 5.7 nT. The 2 MeV electron flux at geosynchronous orbit reached high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to unsettled with isolated active conditions for the next two days (09-10 April). Isolated minor storm levels are possible at high latitudes during this period due to the high speed stream. Activity is expected to be quiet to unsettled on day three (11 April).
III. Event Probabilities 09 Apr to 11 Apr
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       08 Apr 070
  Predicted   09 Apr-11 Apr  070/070/070
  90 Day Mean        08 Apr 072
V. Geomagnetic A Indices
  Observed Afr/Ap 07 Apr  009/012
  Estimated     Afr/Ap 08 Apr  007/010
  Predicted    Afr/Ap 09 Apr-11 Apr  008/010-008/010-005/005
VI. Geomagnetic Activity Probabilities 09 Apr to 11 Apr
A. Middle Latitudes
Active20%20%15%
Minor storm05%05%01%
Major-severe storm01%01%01%
B. High Latitudes
Active30%30%25%
Minor storm10%10%10%
Major-severe storm05%05%01%

All times in UTC

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