Viewing archive of Saturday, 20 April 2002

Geophysical report

Solar and Geophysical Activity Summary 2002 Apr 20 0245 UTC
Prepared by the NOAA © SWPC and processed by

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 Apr
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
B. Proton Events
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
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.

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