Physics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..943b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 42, Nov.-Dec. 1980, p. 943-974.
Physics
4
Atmospheric Models, Extremely Low Frequencies, Ionospheric Disturbances, Ionospheric Propagation, Annual Variations, E Region, Equinoxes, Ionospheric Electron Density, Midlatitude Atmosphere, Sunspots
Scientific paper
The simplified theory of ELF wave propagation in the earth-ionosphere transmission lines developed by Booker (1980) is applied to a simplified worldwide model of the ionosphere. The theory, which involves the comparison of the local vertical refractive index gradient with the local wavelength in order to classify the altitude into regions of low and high gradient, is used for a model of electron and negative ion profiles in the D and E regions below 150 km. Attention is given to the frequency dependence of ELF propagation at a middle latitude under daytime conditions, the daytime latitude dependence of ELF propagation at the equinox, the effects of sunspot, seasonal and diurnal variations on propagation, nighttime propagation neglecting and including propagation above 100 km, and the effect on daytime ELF propagation of a sudden ionospheric disturbance. The numerical values obtained by the method for the propagation velocity and attenuation rate are shown to be in general agreement with the analytic Naval Ocean Systems Center computer program. It is concluded that the method employed gives more physical insights into propagation processes than any other method, while requiring less effort and providing maximal accuracy.
Behroozi-Toosi Amir B.
Booker Henry G.
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