[NZ4O Spaceweather] >(10+0) Energetic Proton Flux Storm

[Thomas F. Giella NZ4O]

Another solar cycle 24 first. A >(10+0) energetic proton flux storm occurred 
today in association with the X2.2 solar flare. Energetic proton flux storms 
create increased D Layer RF signal absorption on 160 and 80 meters on paths 
at high latitudes.

Polar cap absorption is an anomalous condition of the polar ionosphere 
whereby medium frequency (300-3000 kc) radio waves are absorbed, and LF and 
VLF (3-300 kHz) radio waves are wave guided at lower altitudes than normal. 
In practice, the absorption is inferred from the proton flux at energies 
greater than 10 MeV (10+0), so that PCA's, Polar Radio Blackouts and Proton 
Events are interrelated and often simultaneous.

((((NOTE!!! high latitude radio propagation paths may still be disturbed for 
days, up to weeks, following the end of an official proton event.)))) This 
fact is still stubbornly opposed by some otherwise very knowledgeable space 
weather physicists, hung up on threshold riometer readings.

73 & GUD DX,
Thomas F. Giella, NZ4O
Lakeland, FL, USA
solarcycle24 at tampabay.rr.com

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