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Extensive particle-in-cell simulations of fast electron beams injected in abackground magnetised plasma with a decreasing density profile were carriedout. These simulations were intended to further shed light on a newly proposedmechanism for the generation of electromagnetic waves in type III solar radiobursts [D. Tsiklauri, Phys. Plasmas, 18, 052903 (2011)]. The numericalsimulations were carried out using different density profiles and fast electrondistribution functions. It is shown that electromagnetic L and R modes areexcited by the transverse current, initially imposed on the system. In thecourse of the simulations no further interaction of the electron beam with thebackground plasma could be observed.

The effect of initial conditions on the electromagnetic radiation generation in type III solar radio bursts