E-skip is the phenomenon of radio waves reflecting off of highly-charged particles in the E-layer of the ionosphere, allowing them to go thousands of miles or kilometers beyond their intended area of reception. It is not directly related to tropospheric ducting, which is more weather-related.

Normal E-skip, called skywave, occurs every night in the mediumwave and lower shortwave bands, allowing broadcast stations and amateur radio operators on those frequencies to be heard from across the continent. "Sporadic E" sometimes occurs all the way up into the VHF band.

See also

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