The paper is concerned with the radiation condition for an unbounded magnetoplasma which is both anisotropic and dispersive. The usual form of the celebrated Sommerfeld radiation condition pertains to an isotropic and nondispersive medium and is not applicable to a magnetoplasma. A technique based on the principle of causality for the resolution of the consequent ambiquity is discussed. The branch-points and the associated branch-cuts of the integrands in the Fourier integral representations of the two modes which compose the actual field component in a steady state problem are examined with particular emphasis on certain of the branch-points which have been overlooked in the existing literature. Author
Prepared in cooperation with Harvard Univ., Cambridge, Div. of Engineering and Applied Physics.