Viewing archive of Wednesday, 24 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 24 0245 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 114 Issued at 0245Z on 24 Apr 2002 This report is compiled from data received at SWO on 23 Apr
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0204 0204 0204                       180
0806 0806 0807                       310
B. Proton Events
The greater than 100 MeV proton event that began at 21/0155 UTC ended at 22/2335 UTC (peak 22.9 pfu at 21/1025 UTC). The greater than 10 MeV proton event that began at 21/0225 UTC continued (peak 2520 pfu at 21/2320 UTC). The greater than 10 MeV flux at the close of the period was around 120 pfu.
C. Geomagnetic Activity Summary
Geomagnetic field activity ranged from quiet to major storm levels. Field activity increased to active to major storm levels during 23/0300 - 0900 UTC following a sudden impulse at 23/0450 UTC (60 nT, as measured by the Boulder USGS magnetometer). Activity decreased to unsettled to active levels during 23/0900 - 1800 UTC. The field was quiet after 23/1800 UTC.
D. Stratwarm
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 175  SSN 180  Afr/Ap 018/022   X-ray Background B9.9
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 6.5e+07   GT 10 MeV 1.4e+07 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 5.10e+05 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 1 4 5 3 3 4 2 2 Planetary 1 4 6 3 3 4 2 3
F. Comments
  Afr estimated based on Boulder USGS magnetometer data.

All times in UTC

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