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The foreshock region of a CME shock front, where shock accelerated electronsform a beam population in the otherwise quiescent plasma is generally assumedto be the source region of type II radio bursts. Nonlinear wave interaction ofelectrostatic waves excited by the beamed electrons are the prime candidatesfor the radio waves' emission.  To address the question whether a single, or two counterpropagating beampopulations are a requirement for this process, we have conducted 2.5D particlein cell simulations using the fully relativistic ACRONYM code.  Results show indications of three wave interaction leading to electromagneticemission at the fundamental and harmonic frequency for the two-beam case. Forthe single-beam case, no such signatures were detectable.

Emission of Type II Radio Bursts - Single-Beam versus Two-Beam Scenario