Viewing archive of Wednesday, 28 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: 20040728SGAS.txt
:Issued: 2004 Jul 28 0250 UT
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.comJoint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 210 Issued at 0245Z on 28 Jul 2004 This report is compiled from data received at SWO on 27 JulA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0523 0523 0523 130 0541 0545 0552 0652 N02W53 M1.1 1n 320 100 0556 0556 0556 930 1127 1128 1128 100 1959 2020 2037 0652 N09W65 M1.5 1f 2346 0000 0011 0652 N10W54 M1.2 1f
B. Proton Events
The greater than 10 MeV proton event that began
on 25/1855Z is still in progress. A rapid, short-lived increase in
the greater than 10 MeV protons to 2,090 pfu occurred with the shock
passage at 25/2250Z. Protons quickly declined and were straddling
the 10 pfu alert threshold by the end of the period.
C. Geomagnetic Activity Summary
The geomagnetic field ranged from
active to severe storming. A strong sudden impulse (SI) of 95 nT
was observed on the Boulder magnetometer at 26/2228Z. This SI
followed the very fast (~31 hours) transit of the full halo CME
associated with the long duration M1 flare on 25/1514Z. Solar wind
speed increased from the already elevated levels near 600 km/s to
over 1050 km/s. After approximately four hours of fluctuating
between -15 and +15 nT, the IMF Bz rotated strong southward and
ranged from -15 to -25 nT for about 15 hours. The fast solar wind
speed and southward Bz combined to produce severe geomagnetic storm
levels at all latitudes from 27/0000Z to 27/1500Z. Solar wind speed
was still near 900 km/s by the end of the period but Bz was near
zero. The disturbance declined to minor storm levels to end the
period.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 118 SSN 066 Afr/Ap 131/162 X-ray Background B4.4 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 2.7e+08 GT 10 MeV 1.9e+06 p/(cm2-ster-day) (GOES-11 satellite synchronous orbit W97 degrees) Daily Electron Fluence GT 2 MeV 9.40e+07 e/(cm2-ster-day) (GOES-12 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 7 7 7 8 8 6 4 5 Planetary 8 7 8 8 9 7 5 5
F. Comments
None
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