Viewing archive of Thursday, 12 April 2001

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 2001 Apr 12 0245 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 102 Issued at 0245Z on 12 Apr 2001 This report is compiled from data received at SWO on 11 Apr
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0024 0031 0035              M1.0       52
1256 1326 1349  9415 S22W27 M2.3  1f 3100   540    II/IV
B. Proton Events
The greater than 10 MeV proton event that began at 0850 UTC on 10 April continues in progress. The peak flux so far is 355 PFU at 2055 UTC on 11 April. The day end flux value was 113 PFU.
C. Geomagnetic Activity Summary
The geomagnetic field ranged from quiet to severe storm levels, with a maximum estimated Kp-index of 8. A sudden storm commencement was observed at 1343Z on 11 April.
D. Stratwarm
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 160  SSN 178  Afr/Ap 050/060   X-ray Background B7.9
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 3.6e+08   GT 10 MeV 1.2e+07 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 1.30e+08 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 3 3 3 2 3 8 5 6 Planetary 3 3 3 2 4 8 6 7
F. Comments
  The greater than 2 MeV electron fluxes at
Geosynchronous orbit attained high levels during the past 24 hours.

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