Viewing archive of Thursday, 18 July 2002

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 2002 Jul 18 0245 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 199 Issued at 0245Z on 18 Jul 2002 This report is compiled from data received at SWO on 17 Jul
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0658 0713 0719  0030 N21W17 M8.5  1b 200    610    II
1410 1410 1416                       120
1532 1532 1533                       100
2149 2150 2150                       210
B. Proton Events
Greater than 10 MeV protons exceeded the 100 pfu threshold at 17/1250 UTC, reached a peak value of 234 pfu at 17/1600 UTC and ended at 17/1710 UTC. Greater than 10 MeV protons remain above the 10 pfu threshold as of this forecast issue.
C. Geomagnetic Activity Summary
The geomagnetic field has been quiet to active. A sudden impulse occurred at 17/1604 UTC and measured 18 nT on the San Juan magnetometer. Active conditions followed the sudden commencement. A PCA event began at 16/2215 UTC and reached a peak absorption 4.8 Db on the Thule 30 MHz riometer. Greater than 2 MeV electron at geo-synchronous orbit reached moderate levels.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 180  SSN 179  Afr/Ap 016/018   X-ray Background B7.6
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 2.5e+08   GT 10 MeV 6.4e+06 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 1.40e+07 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 2 3 4 2 3 4 3 3 Planetary 3 3 4 3 3 4 4 3
F. Comments
  None

All times in UTC

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