Nonlinear Wave Interactions as Emission Process of Type II Radio Bursts

Details Nonlinear Wave Interactions as Emission Process of Type II Radio Bursts Nonlinear Wave Interactions as Emission Process of Type II Radio Bursts

2012-04-02

arxiv.org/abs/1204.0355v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 5 figures, accepted for ApJ

Scientific paper

The emission of fundamental and harmonic frequency radio waves of type II radio bursts are assumed to be products of three-wave interaction processes of beam-excited Langmuir waves. Using a particle-in-cell code, we have performed simulations of the assumed emission region, a CME foreshock with two counterstreaming electron beams. Analysis of wavemodes within the simulation shows self-consistent excitation of beam driven modes, which yield interaction products at both fundamental and harmonic emission frequencies. Through variation of the beam strength, we have investigated the dependence of energy transfer into electrostatic and electromagnetic modes, confirming the quadratic dependence of electromagnetic emission on electron beam strength.

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