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- W2096972355 abstract "Fields of cylindrically curved ionosphere layers are approximated by exponential functions that consider the increase of the phase velocity and decrease of the attenuation rate with the altitude of the layers. Matrix multiplication techniques are applied to the treatment of multilayer ionosphere models. The individual ionosphere layers are thin relative to the wavelength, and the approximate field representations give in the limits of horizontal and radial static magnetic field results identical to those obtained using more accurate treatments of curvature effects. TM modes in the space between the earth and the ionosphere excite coupled TM and TE modes in the ionospheric layers, the presence of which are considered in an iterative solution of the modal equation. In the ELF range, propagation parameters computed for the east-to-west (EW) and west-to-east (WE) directions differ most for dip angles of 15-30°. In the VLF range propagation parameters may exhibit discontinuities at nighttime for the EW direction, when the fields penetrate higher into the ionosphere. The interference distance D of the two lower wave guide modes is increased for propagation in the EW direction relative to propagation in WE direction provided that the electron concentration profiles exhibit sharp density gradients at heights in the range from 80 to 85 km. The desired propagation characteristics could not be produced in the presence of a nondipping static magnetic field or using smoothly varying electron concentration profiles." @default.
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- W2096972355 date "1968-01-01" @default.
- W2096972355 modified "2023-10-17" @default.
- W2096972355 title "Propagation of ELF and VLF waves below an anisotropic ionosphere with a dipping static magnetic field" @default.
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- W2096972355 doi "https://doi.org/10.1029/ja073i001p00339" @default.
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