Duct propagation of hydromagnetic waves in the upper ionosphere. II - Dispersion characteristics and loss mechanism

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Atmospheric Attenuation, Geomagnetic Micropulsations, Ionospheric Propagation, Magnetohydrodynamic Waves, Wave Dispersion, Atmospheric Models, E Region, Magnetosphere-Ionosphere Coupling

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A simplified horizontally stratified layered ionosphere model was used to study the ducted propagation of short-period hydromagnetic waves in the upper ionosphere and the loss mechanism of the ducted waves. It is shown that the energy dissipation of the ducted wave proceeds via three major mechanisms: the ionospheric Joule loss, the Poynting loss due to the Alfven wave converted from the fast magnetosonic wave, and the telluric Joule loss. The ionospheric Joule loss has the largest contribution to the spatial attenuation of the ducted wave when the Pedersen conductivity is not much smaller than the Hall conductivity. The effect of the telluric loss is inversely proportional to an increase in the wave frequency, caused by a reduction in the electric field intensity in the conducting earth. Other possible mechanisms of the energy loss of the ducted wave are discussed.

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