Viewing archive of Tuesday, 13 April 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.
Solar and Geophysical Activity Summary 2004 Apr 13 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 104 Issued at 0245Z on 13 Apr 2004 This report is compiled from data received at SWO on 12 AprA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0951 0951 0951 900
B. Proton Events
The greater than 10 MeV proton event that began
at 11/1135Z, peaked at 35 pfu at 11/1845Z, and ended at 12/0405Z.
This proton event is likely to be associated with the C9 flare that
occurred at 11/0419Z.
C. Geomagnetic Activity Summary
The geomagnetic field was at quiet
to active levels. A shock passage was observed at the ACE
spacecraft at approximately 12/1730Z and it is believed to be in
response to the partial halo CME that was associated with the C2
flare that occurred on 09/2040Z. Once again, the IMF Bz remained
predominantly northward and the geomagnetic response was weak.
Solar wind speeds peaked at near 540 km/s shortly after the shock
passage.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 091 SSN 037 Afr/Ap 013/011 X-ray Background A8.9 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 4.4e+07 GT 10 MeV 4.3e+05 p/(cm2-ster-day) (GOES-11 satellite synchronous orbit W98 degrees) Daily Electron Fluence GT 2 MeV 7.80e+07 e/(cm2-ster-day) (GOES-12 satellite synchronous orbit W76 degrees) 3 Hour K-indices Boulder 4 2 4 2 2 2 3 2 Planetary 3 2 4 3 2 2 3 1
F. Comments
None
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