An updated version of an earlier waveguide program has been written In the FORTRAN compiler language. The new program Includes the following alterations or additions; (1) An Improved Runge-Kutta routine; (2) A procedure which finds directly the starting solutions at the top of the Ionosphere; (3) Provision for Including up to five charged particles; (U) A method for economically finding approximate waveguide solutions; and modifications for use of the program for ELF wave propagation. ' mco *■ CO a-i-il £o ~ electric permittivity of free space li =■ magnetic permeability of free space Lf s geomagnetic field CO = angular wave frequency
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