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Boundaries of the Terrestrial Waveguide
Natural Sources of Radiation
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Airy function altitude amplitude angle anisotropic ionosphere antipode atmospherics attenuation rates boundary conditions calculations Chapter collision frequencies computed curves cylindrical daytime decreased Deeks differential equation direction of propagation distance E.W. direction earth electric field electromagnetic electron density excitation factors exhibit exponential F-layer field expressions field representations free-space Galejs geometry ground conductivity ground surface Hankel functions height height-gain functions horizontal electric dipole increased integral ionospheric boundary ions isotropic kc/s layer Legendre functions lightning discharges lower ionosphere magnitude matrix measurements mho/m modal equation normalized impedance permittivity phase velocity polarized source profiles propagation parameters radial functions Radio Sci ratio reflection coefficients refractive index resonance frequencies return stroke Schumann resonances Section Sharply Bounded Homogeneous shown in Fig solution spherical geometry static magnetic field Substituting summation surface impedance T.E. modes T.M. field components Taylor series thin-shell approximations V.L.F. range V.L.F. waves values vertical electric dipole waveforms waveguide zonal harmonics