Viewing archive of Thursday, 25 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 25 0245 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 115 Issued at 0245Z on 25 Apr 2002 This report is compiled from data received at SWO on 24 Apr
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0246 0246 0246                       150
1121 1122 1129  9915 N12E17       Sf 2500
1312 1316 1326       S18E01 C1.0  Sf 630
1335 1342 1354       S18E00       Sf 110
1707 1707 1709                       130
1743 1754 1805              C1.9     400
2146 2156 2201  9912 N09W49 M1.7  1f
2229 2230 2230                       170
B. Proton Events
The greater than 10 MeV proton event that began at 21/0225 UTC continued. The greater than 10 MeV flux at the close of the period was around 22 pfu and gradually decreasing.
C. Geomagnetic Activity Summary
Geomagnetic field activity was at quiet to unsettled levels.
D. Stratwarm
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 177  SSN 256  Afr/Ap 007/007   X-ray Background B9.2
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 1.7e+07   GT 10 MeV 5.6e+06 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 2.70e+05 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 3 1 1 2 2 3 1 2 Planetary 3 1 1 2 2 3 2 2
F. Comments
  Afr estimated based on Boulder USGS magnetometer data.

All times in UTC

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