The spectrum of synchrotron-transient radiation of a charged particle in plasma with random inhomogeneities

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Charged Particles, Emission Spectra, Nonuniform Plasmas, Plasma Radiation, Plasma-Particle Interactions, Synchrotron Radiation, Asymptotic Methods, Harmonic Radiation, Plasma Density, Transient Response

Scientific paper

The radiation of a charge rotating in a circle with the constant velocity (in the external magnetic field) in the isotropic plasma with random inhomogeneities of the electron density has been considered. A general expression is obtained for the radiation intensity at the nth harmonic, which is a generalization of the known Shott formula. In the ultra-relativistic case the conditions are clarified under which the inhomogeneity effect on the form of the spectrum of radiation from a particle is essential. An asymptotic formula is derived for the spectral intensity in the region of sufficiently low frequencies. The mechanism of transient radiation in this case is shown to prevail over the synchrotron one.

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