Viewing archive of Friday, 19 April 2002

Geophysical report

Solar and Geophysical Activity Summary 2002 Apr 19 0245 UTC
Prepared by the NOAA © SWPC and processed by

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 Apr
A. 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
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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