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The effect of motion of heavy ions on the radiation characteristics of a point charge moving with uniform velocity along the direction of the external magnetic field in a plasma is investigated. For the case of stationary ions, two modes are found to be excited up to zero frequencies for values of the normalized strength of the external magnetic field above a certain minimum value. The result of inclusion of the motion of heavy ions is that the ordinary mode has a resonance at the so-called lower hybrid resonant frequency below which it is not excited and the extraordinary mode is excited up to zero frequencies even for very small values of the normalized strength of the external magnetic field. The power radiated in the ordinary mode in the neighborhood of the lower as well as the upper hybrid resonant frequencies is relatively large. The frequency and the angular spectrum of the emitted radiation as well as the direction of the Cerenkov rays are evaluated for some typical parameter values which include those usually obtained in the exosphere.

Radiation from a uniformly moving charge in an anisotropic 2 component plasma