An investigation is presented of certain aspects of those gyroresonance interactions which take place between very low frequency VLF electromagnetic waves and charged particle fluxes in the earths outer ionosphere. These interactions, in which significant amounts of energy can be exchanged between the particles kinetic energy form and the wave electromagnetic-energy form, are thought to be of importance with respect to the dynamical properties of the earths outer ionosphere. Specifically two problems are considered. The first problem involves the stability of the outer ionosphere plasma to whistler-mode waves under conditions in which high energy electron fluxes permeate this plasma. The second problem involves the feasibility of the creation or depletion of an artificial radiation belt utilizing the geocyclotron gyroresonance interaction in order to transfer energy between man-made waves and relativistic electrons trapped in the outer ionosphere by the earths magnetic field near the magnetic equatorial plane.