Ionospheric whistler propagation

Physics

Scientific paper

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Earth Magnetosphere, Ionospheric Propagation, Ray Tracing, Whistlers, Atmospheric Models, Diurnal Variations, Ducts, F Region, Hiss, Very Low Frequencies

Scientific paper

Ray-tracing in a set of transition-level-gradient magnetosphere models chosen to fit the range of day-to-day variations of observed latitudinal density profiles indicates that transmission from duct to ground and ground to duct is most likely for duct entry/exit in the altitude range 1200-1500 km. As a consequence of the typical altitude of the duct entry/exit being approximately 1500 km (substantially higher than previously thought), only a small fraction of the whistler energy exiting from a given duct and reflected from the base of the ionosphere will reenter that duct, which implies that 10-20 dB of magnetosphere amplification per hop is needed to sustain multihop whistlers and midlatitude hiss. Mixed-path whistlers might result when some of the reflected energy enters adjacent ducts. It is suggested that whistlers are typically transmitted down into the earth-ionosphere wave guide at L-values 0.2 to 0.3 less than the L-shell of magnetospheric propagation.

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