Physics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37.1525f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 37, Dec. 1975, p. 1525-1534.
Physics
Electron Density Profiles, Ionospheric Electron Density, Ionospheric Propagation, Ray Tracing, Very Low Frequencies, Atmospheric Models, Canonical Forms, Coupling Coefficients, D Region, Linear Equations, Refractivity, Wave Equations, Whistlers
Scientific paper
The influence of horizontal density gradients of electron density on the wave-normal direction of VLF waves propagated upwards through the ionosphere is studied. It is shown that in the case of constant logarithmic gradients, the horizontal components of the unit wave normal at a given altitude can be approximated by linear functions of these gradients. The limits of validity of this approximation are studied numerically by ray tracing. Theoretical expressions for the coefficients of the linear relations are given and the influence of the latitude, frequency and vertical density profile are discussed.
Cerisier Jean-Claude
de Feraudy Herve
Fiszleiber F.
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