Here's a link to a brief Navy document (gotta be true!) that gives a
simple overview of noise. It claims coronal discharges are the principal
cause of precipitation static. No mention, however, of any other,
non-principal causes.

http://www.globalsecurity.org/milita...14030_ch10.pdf
14030_ch10.pdf (application/pdf Object)

Evidently, aircraft encounter current densities between 50-300 A/square
meter, while typical current densities near the ground from charged
precipitation are on the order of 1 uA/square meter. That's quite a few
orders of magnitude difference.

http://www.jya.com/mil-std-464.htm
MIL-STD-464


Chuck

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