Bearing Deviation in High-Frequency Transionospheric Propagation: 3. Ray Tracing Investigation of the Magnetoionic Effect


  • N. Narayana Rao


The influence of an earth-centered dipole magnetic field upon the bearing deviation of medium range HF ray paths in the ionosphere is investigated by using the ESSA three-dimensional computer ray tracing program for a variety of conditions involving quasi-parabolic layer models and actual electron density profiles deduced from ionograms gathered during a direction finding experiment. The adequacy of the dipole model is examined by comparing the bearing deviations obtained from it with those for a magnetic field based upon spherical harmonic expansion using Gaussian coefficients.