Viewing archive of Thursday, 18 April 2002

Geophysical report

Solar and Geophysical Activity Summary 2002 Apr 18 0245 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 108 Issued at 0245Z on 18 Apr 2002 This report is compiled from data received at SWO on 17 Apr
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0746 0824 0957  9906 S14W34 M2.6  2n 890    3000   II/IV
1008 1016 1114                       150    230
1413 1413 1413                       290
1559 1559 1559                       150
1643 1643 1643                       100
1912 1912 1913                       210
1932 1933 1933                       210
2010 2010 2011                       2400
2125 2126 2126                       140
B. Proton Events
A greater than 10 MeV proton event began at 17/1530 UTC. The maximum flux observed so far was 24 pfu at 17/1540 UTC. This event remains in progress.
C. Geomagnetic Activity Summary
The geomagnetic field ranged from quiet to major storm levels. A shock was observed at the NASA ACE spacecraft at 17/1022 UTC and was followed by an SI at ground magnetometers at 17/1109 UTC (57 nT at Boulder). This shock is believed to be associated with the LDE M1/CME which occurred on 15 April.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 194  SSN 137  Afr/Ap 031/041   X-ray Background C1.0
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 1.9e+07   GT 10 MeV 4.7e+05 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 6.50e+05 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 2 3 3 5 5 6 4 3 Planetary 2 3 2 6 6 6 5 3
F. Comments
  The 17 April Afr index reported in Part E is estimated
from Boulder observations.

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