Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Plane-Parallel Wind Solution For Testing Numerical Simulations of
  Photoevaporation   Here we derive a Parker-wind like solution for a stratified, plane-parallel
atmosphere undergoing photoionisation. The difference compared to the standard
Parker solar wind is that the sonic point is crossed only at infinity. The
simplicity of the analytic solution makes it a convenient test problem for
numerical simulations of photoevaporation in protoplanetary discs.

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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: hep-th