Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Possibility of Generating Harmonics of the Electron Plasma
  Frequency in the Solar Atmosphere due to Explosive Instability in a System of
  Interpenetrating Electron and Ion Flows   An alternative mechanism is proposed for the generation of harmonics of the
electron plasma frequency due to the development of explosive instability in a
system of interpenetrating electron and proton flows in the solar atmosphere.
The efficiency of the new mechanism in comparison with the earlier discussed
mechanisms involving multistage processes of nonlinear interaction of waves in
plasma is determined. It is shown that the development of explosive instability
can lead to the excitation of the second and third harmonics of the plasma
frequency with comparable amplitudes.

8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con