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 SpaceWeatherLive.comJoint 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 JulA. 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
None
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
None
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