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 MIL-HDBK-419A
THUNDERSTORM DAY -- A local calendar day on which thunder is heard.
UNDESIRED SIGNAL -- Any signal which tends to produce degradation in the operation of equipments or
systems.
WAVE IMPEDANCE -- The ratio of the electric field strength to the magnetic field strength at the point of
observation.
ZONE OF PROTECTION -- (also known as CONE OF PROTECTION) That space that is below and adjacent to
a lightning protection subsystem that is substantially immune to direct lightning discharges.
A-6
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