Influence of Magnetoplasma on Gyro-Synchrotron Radiation

Abstract

The influence of a cold and collisionless magnetoplasma on the gyro-synchrotron radiation from an accelerated electron is considered in detail by solving Maxwell's equations with the aid of a Green tensor and a Fourier transformation. Electromagnetic fields at great distance from a point source are discussed. The frequency spectra of the radiation power of both ordinary and extraordinary waves are numerically calculated for various values of ambient plasma parameters and energy of a radiating electron. It is pointed out that the waves radiated at low harmonic numbers of the gyro-frequency of a radiating electron cannot propagate in a plasma, and that the influence of a magnetolasm on the spectra is important under the condition of fp>fH. These are due to dispersion and anisotropy of the medium. Applications of the results to solar radio type IV bursts are briefly discussed.