Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Resonant-Mode Model of Pulsar Radio Emission   It is argued that the polar gap and flux tube in the pulsar magnetosphere act
as a resonant cavity/waveguide system which is excited by oscillations in the
primary beam current and accelerating potential. The modes will be converted,
probably scattered, to produce radio beams in the frequency range of those
observed.

29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol