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A Numerical Study of VLF Mode Structure and Polarization Below an Anisotropic Ionosphere
Author(s) -
Pappert Richard A.
Publication year - 1968
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196833219
Subject(s) - ionosphere , anisotropy , polarization (electrochemistry) , computational physics , earth–ionosphere waveguide , physics , curvature , mode (computer interface) , normal mode , optics , geophysics , mathematics , geometry , acoustics , ionospheric heater , computer science , chemistry , operating system , vibration
The cylindrical waveguide problem with a diffuse, anisotropic upper boundary is rigorously formulated using a conformal transformation. This will allow us to demonstrate the adequacy of an ad hoc method used in a previous paper for simultaneously treating earth curvature and ionosphericeffects. Weakly attenuated components of the mode spectrum associated with easterly propagation below a highly anisotropic ionosphere are developed numerically in the frequency range from 10–30 kHz. Also, the field strength distributions in the guide are presented. It is shown that modes of the earth detached variety, unlike the usual quasi‐TM or quasi‐TE modes, can contain comparable amounts of vertical and horizontal polarization. The numerical results also suggest that at the high end of the frequency spectrum considered, modes which are principally TE may be of importance in the mode sum.