Physics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..477s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 42, May 1980, p. 477-486.
Physics
Atmospheric Models, E Region, Earth Magnetosphere, Ionospheric Propagation, Mathematical Models, Propagation Modes, Geomagnetism, Magnetic Dipoles, Plasmapause, Waveguides
Scientific paper
This article describes the mathematical method and several characteristic results of a study of radiation of guided mode sources with periods of over 10 s, in two axisymmetric dipolar magnetosphere models (day and night). The sources, also axisymmetric, are situated inside thin shells of field lines close to the equatorial plane. The computations point out a North-South ionospheric wave guide with strong attenuation, which however does not allow much energy to be transferred from one field line to another, in the guided mode. Resonant field lines are determined by the zeros of the electric part of the general solutions of the guided mode in the magnetosphere by day, and by the zeros of the magnetic part by night. For 30 s period sources, the magnetosphere can be considered as six times more resonant in the fundamental mode by night than by day, whereas transmission to the ground is ten times weaker.
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