Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Parametric Investigation on the Cyclotron Maser Instability Driven by
  Ring-beam Electrons with Intrinsic Alfv\'en Waves   The electron-cyclotron maser is a process that generates intense and coherent
radio emission in plasma. In this paper, we present a comprehensive parametric
investigation on the electron-cyclotron-maser instability driven by non-thermal
ring-beam electrons with intrinsic Alfv\'en waves which pervade the solar
atmosphere and interplanetary space. It is found that both forward propagating
and backward propagating waves can be excited in the fast ordinary (O) and
extraordinary (X) electromagnetic modes. The growth rates of X1 mode are almost
always weakened by Alfv\'en waves. The average pitch-angle $\phi_0$ of
electrons is a key parameter for the effect of Alfv\'en waves on the growth
rate of modes O1, O2 and X2. For a beam-dominated electron distribution
($\phi_0 \lesssim 30^\circ$ ), the growth rates of the maser instability for
O1, O2 and X2 modes are enhanced with the increase of Alfv\'en wave energy
density. In other conditions, the growth rates of O1, O2 and X2 modes weakened
with increasing Alfv\'en wave intensity, except that the growth of O1 mode may
also be enhanced by Alfv\'en waves for a ring distribution. The results may be
important for us in analyzing the mechanism of radio bursts with various fine
structures observed in space and astrophysical plasmas.

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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph