Viewing archive of Saturday, 20 April 2002
Geophysical 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.
Solar and Geophysical Activity Summary 2002 Apr 20 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 110 Issued at 0245Z on 20 Apr 2002 This report is compiled from data received at SWO on 19 AprA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep None
B. Proton Events
None
C. Geomagnetic Activity Summary
The geomagnetic field ranged from
unsettled to major storm. A shock was observed at ACE at 19/0804 UTC
and was followed by an SI at ground magnetometers (36 nT at Boulder)
at 19/0836 UTC. This shock is believed to be associated with the LDE
M2/CME that occurred on 17 April.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 180 SSN 182 Afr/Ap 035/044 X-ray Background B8.6 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 5.4e+07 GT 10 MeV 1.9e+05 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 2.80e+07 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 3 4 3 5 5 5 5 5 Planetary 4 4 4 6 6 5 5 5
F. Comments
The 19 April Afre reported in Part E is estimated from Boulder observations.
All times in UTC
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