:Product: 20020418SGAS.txt
:Issued: 2002 Apr 18 0245 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Environment Center and the U.S. Air Force.
#
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.