Thi s is a tutorial expos ition of the theory of ELF propagation in the eart h•ionosp here waveguide.Derivation s are not give n; in s tead, th e plau s ibility of the res ults a nd th e physica l aspects of certain s pec ial cases are discussed.A s implifi ed trea tm ent of th e Schumann cav it y reso nan ce phenomenon is a lso given.
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J.R. Wait (1965) studied this question.
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