Viewing archive of Friday, 20 April 2001

Geophysical report

Solar and Geophysical Activity Summary 2001 Apr 20 0245 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 110 Issued at 0245Z on 20 Apr 2001 This report is compiled from data received at SWO on 19 Apr
A. Energetic Events
Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0217 0000 0000                                     II
1122 1135 1155              M2.0            270
B. Proton Events
None
C. Geomagnetic Activity Summary
The geomagnetic field has been quiet to unsettled. The greater than 100 MeV proton event ended at 19/0325 UTC (start 18/0315 UTC, 12 pfu peak at 18/0600 UTC). The polar cap absorption (PCA) event has also ended (19/1400 UTC). The greater than 10 MeV proton event continues in progress (start 18/0315 UTC, 321 pfu peak at 18/1045 UTC, and current flux about 15 pfu at 19/2100 UTC) and is slowly decaying.
D. Stratwarm
None
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 145  SSN 085  Afr/Ap 008/007   X-ray Background B5.5
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 1.6e+07   GT 10 MeV 2.9e+06 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 6.80e+05 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 3 2 2 2 3 3 2 1 Planetary 3 2 3 1 2 2 1 2
F. Comments
  None

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