The scattering of VLF waves by localized ionospheric disturbances produced by lightning-induced electron precipitation

Physics

Scientific paper

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Electromagnetic Scattering, Electron Precipitation, Ionospheric Disturbances, Lightning, Very Low Frequencies, Ionospheric Electron Density, Three Dimensional Models, Waveguides, Whistlers

Scientific paper

A 3D model of the scattering of VLF waves in the Earth-ionosphere waveguide by localized disturbances in the lower ionosphere is examined for typical disturbances expected to be produced by lightning-induced electron precipitation events. Results indicate that the scattering is generally independent of the conductivity and permittivity of the Earth's surface immediately beneath the disturbed region except for extremely low conductivities such as that found over deep ice caps. Thus the scattered signal is principally a function of the ionospheric perturbation. Moderate-to-large scale disturbances (radius 50-200 km) must be located within 250 km of a moderate-length path (3000-16,000 km) in order to scatter a measurable signal to the receiver. These two findings suggest that the scattered signals can be used with confidence as a diagnostic tool to determine the characteristics of the energetic electron precipitation.

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