Viewing archive of Thursday, 30 October 2003

Geophysical report

Solar and Geophysical Activity Summary 2003 Oct 30 0245 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 303 Issued at 0245Z on 30 Oct 2003 This report is compiled from data received at SWO on 29 Oct
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0026 0151 0208  0486 S16E10 M1.1  1f 5400   63
0137 0337 0412                       5800
0408 0511 0554  0486 S17E06 M3.5  Sn 6600   610       IV
1234 1234 1234                       1000
1348 0000 2354                                        IV
2037 2049 2101  0486 S15W02 X10.0 2b 360000 2500   II/IV
2305 2322 2353       S18W02       Sf 8200
B. Proton Events
The large proton event and GLE that followed the X17 flare on 28 Oct was in decline for most of the period. The greater than 10 MeV proton event that began on 28/1215Z, peaked at 29/0615Z at 29,500 pfu, making it the second largest, greater than 10 MeV proton event this cycle (second only to the 31,700 pfu proton event in November 2001). The greater than 100 MeV proton event began at 28/1145Z, and peaked at 29/0015Z at 186 pfu. The proton events were still in progress when a new stream of protons began, following the X10 flare at around 2100Z.
C. Geomagnetic Activity Summary
The geomagnetic field ranged from unsettled to severe storming. The powerful CME from the X17/4b flare on 28/1110Z, impacted the Earth's magnetic field at 29/0613Z. The transit time for this CME was around 19 hours, making it one of the fastest on record. The sudden impulse measured 140 nT on the Boulder magnetometer. Strong southward IMF Bz initiated severe (K9) storming at middle and high latitudes in the 29/0600 - 0900Z period. Mostly northward Bz occurred from 29/0900 - 1800Z; however, major to severe storming persisted. A sharp southward turn in the Bz occurred at around 1800Z ending the period with K8-9 severe storming. A strong Forbush decrease (over 20%) is in progress.
D. Stratwarm
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 279  SSN 330  Afr/Ap 180/189   X-ray Background C3.3
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 3.0e+09   GT 10 MeV 7.7e+08 p/(cm2-ster-day)
(GOES-11 satellite synchronous orbit W108 degrees)
Daily Electron Fluence
GT 2 MeV 4.70e+06 e/(cm2-ster-day)
(GOES-12 satellite synchronous orbit W77 degrees)
3 Hour K-indices
Boulder 4 3 9 7 6 7 9 8 Planetary 4 3 9 8 7 7 9 8
F. Comments

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