Excited spherical waves in unbounded cold magnetoplasma and applications in radio sounding



[1] The electromagnetic field excited by an arbitrary current source embedded in an unbounded uniform cold magnetoplasma is investigated in this paper. The Green's function method for solving the radiation equation is used, and the derived solution is valid for any cold plasma parameters. There are always two wave modes excited, and in the far field each mode has the form of a spherical wave. A refractive index for spherical waves is introduced to describe the propagation. The properties of these excited spherical waves are discussed in this paper in comparison with the plane wave representation. It is shown that the energy flow of the spherical wave is always in the radial direction, i.e., parallel to the wave normal.