User:IvStewart/Lightning radio

Radio-frequency electromagnetic radiation

Lightning discharges generate radio-frequency electromagnetic waves which can be received thousands of kilometers from their source. The discharge by itself is relatively simple short-lived dipole source that creates a single electromagnetic pulse with a duration of about 1 ms and a wide spectral density. In the absence in the nearby environment of materials with magnetic or electrical interaction properties, at a large distances in a far field zone, the electromagnetic wave will be proportional to the second derivation of the discharge current ^[1]. This is what happens with high-altitude discharges or discharges over areas of a dry land. In other cases, the surrounding environment will change the shape of the source signal by absorbing some of its spectrum and converting it into a heat or re-transmitting it back as modified electromagnetic waves ^[3].

^ Landau, Lev D; Lifshitz, Evgeny M (1975). The Classical Theory of Fields. Vol. 2 (4th ed.). Butterworth-Heinemann. ISBN 978-0-7506-2768-9.
^ Issinski, A. (2016-08-28). "Electromagnetic field records taken August 2016 near Stewart BC, Canada".
^ Landau, Lev D; Lifshitz, Evgeny M; Pitaevskii, Lev P (1984). Electrodynamics of Continuous Media. Vol. 8 (2nd ed.). Butterworth-Heinemann. ISBN 978-0-7506-2634-7.

[1] Landau, Lev D; Lifshitz, Evgeny M (1975). The Classical Theory of Fields. Vol. 2 (4th ed.). Butterworth-Heinemann. ISBN 978-0-7506-2768-9.

[2] Issinski, A. (2016-08-28). "Electromagnetic field records taken August 2016 near Stewart BC, Canada".

[3] Landau, Lev D; Lifshitz, Evgeny M; Pitaevskii, Lev P (1984). Electrodynamics of Continuous Media. Vol. 8 (2nd ed.). Butterworth-Heinemann. ISBN 978-0-7506-2634-7.

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