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 UTCPrepared 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 JulA. 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
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