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A numerical study is made on the ducted-whistler propagation in the magnetosphere by using the phase-integral technique. The guidance in the present model takes place along a dipole field-aligned irregularity with a slowly varying, quartic distribution of ionization density. Numerical calculations are made on the track widths, the mode angles, and the travel times of trapped modes for a wide range of irregularity parameters. Calculations are carried out for a field line for which the shell parameter L=2, Angerami and Thomas's model of ionization density being employed as a background component of the plasma distribution. It is shown that an increase in the transverse size of irregularity may not be responsible for the increase in whistler diffuseness.

Guidance of Whistler Waves in the Magnetosphere, Along Field-Aligned Irregularity with a Quartic Distribution of Ionization Density