RU h, 4, 2012 Trajectory of a short radio wave in the multilayer ionosphere N. D. Naumov 12-th Central Research Institute, Sergiev Posad-7, Moscow region, 141300, Russia E-mail: beloros@mail.ru The exact solution of the ray’s equation in the spherically symmetric ionosphere is obtained when the electron concentration is approximated by a set of quasi-linear and quasi-parabolic functions. <...>