Diffusive Radiation in One-dimensional Langmuir Turbulence

Details Diffusive Radiation in One-dimensional Langmuir Turbulence Diffusive Radiation in One-dimensional Langmuir Turbulence

2007-05-21

arxiv.org/abs/0705.3032v1

Phys.Rev.E76:017401,2007

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, accepted for Phys. Rev. E

Scientific paper

10.1103/PhysRevE.76.017401

We calculate spectra of radiation produced by a relativistic particle in the presence of one-dimensional Langmuir turbulence which might be generated by a streaming instability in the plasma, in particular, in the shock front or at the shock-shock interactions. The shape of the radiation spectra is shown to depend sensitively on the angle between the particle velocity and electric field direction. The radiation spectrum in the case of exactly transverse particle motion is degenerate and similar to that of spatially uniform Langmuir oscillations. In case of oblique propagation, the spectrum is more complex, it consists of a number of power-law regions and may contain a distinct high-frequency spectral peak. %at $\omega=2\omega\pe \gamma^2$. The emission process considered is relevant to various laboratory plasma settings and for astrophysical objects as gamma-ray bursts and collimated jets.

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