Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
0211 0214 0216              C2.2     1800   570
0217 0000 0000                                     II

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The geomagnetic field has been quiet to minor storm, with severe storm conditions at high latitudes. An interplanetary shock passed the ACE spacecraft at 18/0005 UTC; subsequently the Boulder magnetometer registered a 50 nT sudden impulse at 18/0048 UTC. This shock was likely associated with the X14/2B on 15 April. Greater than 10 MeV and greater than 100 MeV proton events began at 18/0315 UTC and 18/0255 UTC respectively, most likely associated with the activity from old Region 9415 behind the west limb. The greater than 10 MeV protons reached a peak of 321 pfu at 18/1045 UTC, while the greater than 100 MeV reached 12 pfu at 18/0600 UTC. The Thule neutron monitor measured a ground level event between 18/0242 UTC and 18/0914 UTC; polar cap absorption (PCA) event began at 18/0425 UTC and remains in progress. Values for the greater than 2 MeV electrons at geosynchronous orbit were not reported due to sensor contamination by the proton event.

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10 cm 132  SSN 063  Afr/Ap 026/050   X-ray Background B5.7
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 5.0e+07   GT 10 MeV 1.2e+07 p/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
Daily Electron Fluence
GT 2 MeV 2.20e+06 e/(cm2-ster-day)
(GOES-8 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 5 5 5 3 3 3 3 2 Planetary 5 7 7 4 3 4 1 2

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