Viewing archive of Wednesday, 9 April 2003

Geophysical report

Solar and Geophysical Activity Summary 2003 Apr 09 0245 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 099 Issued at 0245Z on 09 Apr 2003 This report is compiled from data received at SWO on 08 Apr
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0723 0724 0724                       100
1329 1329 1329                       110
B. Proton Events
C. Geomagnetic Activity Summary
The geomagnetic field was at quiet to active levels. A CME shock from the M1 event on 04 April arrived early today with a 33 nT sudden impulse at 08/0115Z recorded on the Boulder magnetometer. Bz reached values near minus 10 nT and solar wind velocity reached peak values near 500 km/s. Unsettled to active levels were observed at mid latitudes and an isolated minor storm condition on the planetary index.
D. Stratwarm
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 112  SSN 052  Afr/Ap 018/020   X-ray Background B1.9
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 6.0e+06   GT 10 MeV 2.2e+04 p/(cm2-ster-day)
(GOES-10 satellite synchronous orbit W135 degrees)
Daily Electron Fluence
GT 2 MeV 1.40e+07 e/(cm2-ster-day)
(GOES-10 satellite synchronous orbit W135 degrees)
3 Hour K-indices
Boulder 3 3 4 4 3 4 2 3 Planetary 2 3 4 5 4 4 2 3
F. Comments
  Beginning 1500 UTC April 8, SEC will begin using data
from the GOES 12 satellite, and stop receiving GOES 8 data. GOES 12
has the new Solar X-Ray Imager (SXI), which will acquire real-time,
operational images of the solar x-ray flux. With the switch from
GOES 8 to GOES 12, the primary/secondary designations will change.
GOES 12 will be the primary satellite for the SXI. All other data,
including magnetometer, XRS x-ray measurements, and energetic
particles, will have GOES 10 as their primary source, with GOES 12
as the secondary source where available. Please see for important information on this

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