Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38...27c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 38, Jan. 1976, p. 27-36.
Physics
1
Ionospheric Electron Density, Midlatitude Atmosphere, Radio Transmission, Whistlers, Annual Variations, Diurnal Variations, Latitude, Ray Tracing, Upper Ionosphere, Very Low Frequencies
Scientific paper
Ionospheric electron density gradients in the mid-latitude ionosphere have been studied experimentally through their effect on the wave-normal direction of upgoing artificial VLF waves. From the diurnal and seasonal variations of the east-west and north-south components of the unit wave normal, the horizontal gradients of electron density are deduced. It is shown that the direction of propagation of the waves is closely related to certain broad features of the ionospheric structure, namely its variations with longitude or local time which act upon the E-W component of the wave normal and its latitudinal variations which influence the N-S component. These data shed some light on the choice of the initial wave-normal directions for use in magnetospheric ray-tracing studies.
Cairo L.
Cerisier Jean-Claude
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