Duct propagation of a short-period hydromagnetic wave based on the International Reference Ionosphere model

Details Duct propagation of a short-period hydromagnetic wave based on the International Reference Ionosphere model Duct propagation of a short-period hydromagnetic wave based on the International Reference Ionosphere model

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35...91f&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Jan. 1987, p. 91-103.

Physics

20

Earth Ionosphere, Ionospheric Propagation, Magnetohydrodynamic Waves, Reference Atmospheres, Wave Propagation, Diurnal Variations, Ionospheric Conductivity, Magnetoacoustic Waves, S Waves, Wave Attenuation, Wave Dispersion

Scientific paper

Using a realistic model ionosphere based on the International Reference Ionosphere, dispersion properties of duct propagation of a short-period hydromagnetic wave are investigated. Attenuation of a ducted wave is usually determined by ionosphere conductivities at an altitude of the minimum Alfven speed because the electric field disturbance of a ducted wave has its maximum intensity at an altitude of the minimum Alfven speed. Moreover, the ionospheric Joule loss is larger than the Poynting loss by an induced shear Alfven wave. It is also found that the attenuation is large for a ducted wave propagating in a plane out of geomagnetic meridian by virtue of mode coupling between a shear Alfven wave and a fast magnetosonic wave due to vertically continuous distributions of plasma and the ambient magnetic field. In the case of off-meridional propagation in the nighttime, the attenuation has quasi-sinusoidal variation against a frequency of a ducted wave.

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