Trapping of whistler-mode waves in ducts with tapered ends

Details Trapping of whistler-mode waves in ducts with tapered ends Trapping of whistler-mode waves in ducts with tapered ends

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43.1071s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 43, Oct. 1981, p. 1071-1079. Research supported by the Science Research Co

Physics

23

Electron Density (Concentration), Propagation Modes, Radiation Trapping, Ray Tracing, Whistlers, Atmospheric Models, Lines Of Force, Night Sky, Summer, Winter

Scientific paper

The trapping of whistler-mode waves in field-aligned electron density enhancements (ducts) with tapered bases is investigated by ray-tracing for ducts terminating above 1600 and 900 km corresponding to summer day and summer night conditions respectively. This complements previous ray-tracing calculations made for ducts extending down to 300 km (Strangeways, 1981). The position and size of whistler exit-points is estimated for the model ducts employed. These are found to vary from 15 to 90 km in size and are located equatorwards of the foot of the field line of the duct. Two trapping modes are generally operative, corresponding to trapping through the base region and side of a duct and can result in two separated exit-points for a single duct. The variation of the trapping properties of a duct with the altitude above which it terminates is investigated in detail for both summer day and winter night conditions for altitudes of termination between 200 and 1900 km. The altitude of duct termination has a very marked effect on the proportion of waves trapped by each of the trapping modes. It also influences the range of initial latitude from which rays can become trapped in the duct, the effect being greatest for the winter night model.

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