A magnetohydrodynamic approximation is developed for magnetic fields strong enough so that the Larmor radii and periods of the electrons are negligible while those of the ions are not. Electrons are then bound to the field lines while the ions are chiefly influenced by electrostatic forces. This formalism is applied to the particular pro blem of stationary, large amplitude waves and solutions are given for the case where the Alfven velocity is small compared to light velocity. Author
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