Viewing archive of Friday, 31 October 2003

Geophysical report

Solar and Geophysical Activity Summary 2003 Oct 31 0245 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 304 Issued at 0245Z on 31 Oct 2003 This report is compiled from data received at SWO on 30 Oct
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0156 0207 0229  0488 N08W22 M1.6  1f
0705 0705 0705                       250
0720 0721 0721                       120
1009 1009 1012                       1500
1333 1333 1333                       2500
1502 1504 1504                       230
1515 1528 1537  0486        M1.5            29
1906 1906 1908                       490    100
1918 1921 1927              C5.6     500
B. Proton Events
A new surge of high energy protons followed the X-10 flare, enhancing the existing greater than 10 MeV and greater than 100 MeV proton events from the X17 flare on the 28th. This enhancement reached 110 pfu (29/2310Z) in the greater than 100 MeV level, and 3300 pfu (30/1935Z) in the greater than 10 MeV level. A polar cap absorption continues and the proton event remains in progress.
C. Geomagnetic Activity Summary
The geomagnetic field was at predominantly minor to severe storm levels. The intense geomagnetic storm that began at 29/0611Z continued through the first half of this period. Severe levels were observed from 30/0000 - 0600Z. A short-lived "lull" (K5-6) in activity preceded the onset of another severe geomagnetic storm. The very fast CME from the X10 flare that peaked at 29/2049Z impacted the magnetic field at around 30/1600Z - a remarkably fast 19-hour transit from Sun to Earth. Sustained southward IMF Bz in the -15 to -30 Nt range is assuring a severe response. A Forbush decrease at around 20% remains in progress.
D. Stratwarm
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 271  SSN 293  Afr/Ap 147/162   X-ray Background C2.8
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 7.7e+08   GT 10 MeV 1.4e+08 p/(cm2-ster-day)
(GOES-11 satellite synchronous orbit W108 degrees)
Daily Electron Fluence
GT 2 MeV 1.90e+07 e/(cm2-ster-day)
(GOES-12 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 7 7 5 5 4 7 8 9 Planetary 8 7 6 5 5 8 9 9
F. Comments

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