Theory of wave polarization of radio waves in magnetospheric cavities

Details Theory of wave polarization of radio waves in magnetospheric cavities Theory of wave polarization of radio waves in magnetospheric cavities

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987rspsa.412...25b&link_type=abstract

Royal Society (London), Proceedings, Series A - Mathematical and Physical Sciences (ISSN 0080-4630), vol. 412, no. 1842, July 8,

Physics

1

Cavities, Earth Magnetosphere, Planetary Atmospheres, Polarized Electromagnetic Radiation, Radio Waves, Coupled Modes, Differential Equations, Jupiter Atmosphere, Magnetospheric Electron Density, Ray Tracing, Saturn Atmosphere, Wave Equations

Scientific paper

The propagation of LF radio waves in a magnetospheric cavity is investigated theoretically, with a focus on the effects of magnetic-field-induced cumulative coupling between ordinary and extraordinary waves (OWs and EWs) at low electron concentrations on the wave polarization. The theoretical background and its implications for the interpretation of planetary LF data are reviewed; the notation employed in the analysis is explained; the straightness of the rays is examined by ray tracing; the governing differential equations are derived; and their coupled form is applied to the earth, Jupiter, and Saturn magnetospheres. Numerical results are presented graphically. A path-dependent minimal plasma frequency is determined, above which the polarization of an initial OW or EW remains close to that of a locally produced OW or EW (respectively) with the same wave-normal direction.

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