Viewing archive of Tuesday, 27 July 2004

Geophysical report

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
:Product: 20040727SGAS.txt :Issued: 2004 Jul 27 0250 UT Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 209 Issued at 0245Z on 27 Jul 2004 This report is compiled from data received at SWO on 26 Jul
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
 0536 0552 0601  0652 N02W41 M1.3  Sf        61                     
 0610 0000 0000                                        IV           
 0647 0647 0647                       460                           
 1723 1730 1737  0652 N03W45 M1.1  2n        38                     
 1758 1758 1759                       110                           
 2346 0000 0011  0652        M1.2                                   
B. Proton Events
The greater than 10 MeV proton event that began yesterday at 25/1855Z, is still in progress.
C. Geomagnetic Activity Summary
The geomagnetic field ranged from quiet to severe storm levels. The severe geomagnetic storm that occurred yesterday, continued into the early hours of this period. Major to severe geomagnetic storm periods were observed through 26/0300Z. Solar wind speed remained elevated from 500 to over 700 km/s, but IMF Bz was generally around zero from 0300 to 2228Z. Consequently, the geomagnetic field was mostly quiet to unsettled. A strong shock impacted the ACE spacecraft at 26/2228Z. A sudden impulse (SI) of 96 Nt was observed on the Boulder magnetometer at 2251Z. Major to severe storming ensued. This CME was associated with the long-duration M1 flare at 25/1514Z. The CME made a very fast Sun to Earth transit - just over 31 hours.
D. Stratwarm
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 128  SSN 113  Afr/Ap ???/031   X-ray Background B6.6
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 1.6e+08   GT 10 MeV 9.5e+06 p/(cm2-ster-day)
(GOES-11 satellite synchronous orbit W97 degrees)
Daily Electron Fluence
GT 2 MeV 4.30e+08 e/(cm2-ster-day)
(GOES-12 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 6 4 3 3 2 2 3 6 Planetary 6 4 3 3 3 2 3 6 
F. Comments

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