Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..219s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, April 1983, p. 219-229. Research supported by the Scie
Physics
10
Cold Plasmas, Earth Magnetosphere, Electromagnetic Wave Transmission, Ionospheric Propagation, Refractivity, Anisotropic Media, Atmospheric Refraction, Plane Waves, Wave Dispersion
Scientific paper
The refractive index surface, expressing the refractive index of an electromagnetic wave in an anisotropic plasma as a function of the frequency and the wave normal direction, has been widely used in the description of wave propagation in the earth's ionosphere and magnetosphere. The present paper examines the properties of refractive index surfaces for conditions typical of the earth's magnetosphere. A relatively simple form of the cold plasma dispersion relation is used to derive general results concerning the permissible shapes of the refractive index surfaces, and a classification of surface shapes is proposed. Relations of the refractive index surface with the ray surface are discussed, and features and the frequency dependence of the Storey cone angle, defined as the ray direction at a point of inflection on the refractive index surface, are examined. Consideration is also given to the boundaries in the CMA diagram which separate regions where different types of refractive index surface exist, and to the effects of collisions.
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