Viewing archive of Friday, 19 April 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 Apr 19 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 109 Issued at 0245Z on 19 Apr 2002 This report is compiled from data received at SWO on 18 AprA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0145 0145 0145 160 0527 0530 0533 C1.8 200 1430 1433 1435 9907 S04W16 C1.5 Sf 120 1734 1734 1734 150
B. Proton Events
Yesterday's greater than 10 MeV proton event has
ended: start 17/1530 UTC, maximum flux (24 pfu) 17/1540 UTC, and end
18/0035 UTC.
C. Geomagnetic Activity Summary
The geomagnetic field ranged from
quiet to severe storm levels in response to the CME that impacted
the Earth early on 17 April. ACE solar wind information suggests
that this CME has passed.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 188 SSN 160 Afr/Ap 045/054 X-ray Background C1.3 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 4.4e+07 GT 10 MeV 3.1e+05 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 4.40e+06 e/(cm2-ster-day) (GOES-8 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 5 7 5 5 4 4 2 3 Planetary 6 7 6 5 4 4 4 3
F. Comments
The 18 April Afr reported in Part E is estimated from Boulder observations.
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