Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Updated Measurements of Proton, Electron, and Oxygen Temperatures in the
  Fast Solar Wind   The high-speed solar wind is typically the simplest and least stochastic type
of large-scale plasma flow in the heliosphere. For much of the solar cycle, it
is connected magnetically to large polar coronal holes on the Sun's surface.
Because these features are relatively well-known (and less complex than the
multiple source-regions of the slow wind), the fast wind is often a useful
testing-ground for theoretical models of coronal heating. In order to provide
global empirical constraints to these models, here we collect together some
older and more recent measurements of the temperatures of protons, electrons,
and oxygen ions as a function of radial distance.

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The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
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
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol