Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of electron holes on cyclotron maser emission driven by
  horseshoe distributions   This Brief Communication presents a quantitative investigation for the effect
of electron holes on electron-cyclotron maser (ECM) driven by horseshoe
distributions. The investigation is based on an integrated distribution
function for the horseshoe distributions with electron holes. Results show that
the presence of electron holes can significantly enhance the ECM growth rate by
2-3 times in a very narrow waveband. The present study suggests that these
electron holes probably are responsible for some fine structures of radiations,
such as narrowband events in auroral kilometric radiation and solar microwave
spikes.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat