Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of initial conditions on the electromagnetic radiation
  generation in type III solar radio bursts   Extensive particle-in-cell simulations of fast electron beams injected in a
background magnetised plasma with a decreasing density profile were carried
out. These simulations were intended to further shed light on a newly proposed
mechanism for the generation of electromagnetic waves in type III solar radio
bursts [D. Tsiklauri, Phys. Plasmas, 18, 052903 (2011)]. The numerical
simulations were carried out using different density profiles and fast electron
distribution functions. It is shown that electromagnetic L and R modes are
excited by the transverse current, initially imposed on the system. In the
course of the simulations no further interaction of the electron beam with the
background plasma could be observed.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex