Effect of earth-ionosphere waveguide propagation on polarization and arrival angles of whistlers

17 The purpose of the present paper is to discuss the effect of the Earth-ionosphere waveguide propagation on the polarization and arrival angles of whistlers for a refined model of calculation. It is found that the effect of multi-rays is,generally,relatively small for incident angles less than 60° for which the field analysis direction finding is very effective,but it is very large for higher incident angles. This effect appears as the error in arriving direction less than 15° for nighttime and 10° for daytime for incident angles less than 60°. The azimuthal dependence of the effect of multi-rays is first studied,and it shows slight dependence in which the effect is maximized in the North to South propagation in the Northern hemisphere. The resultant polarization does not differ from the limiting polarization for a direct ray and it is nearly circular. These theoretical calculations are compared with experimental data,resulting in a necessity of the refinement of the model of wave emergence at the base of the ionosphere.