Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Statistical study of particle acceleration in the core of foreshock
  transients   Several types of foreshock transients upstream of Earth's bow shock
possessing a tenuous, hot core have been observed and simulated. Because of the
low dynamic pressure in their cores, these phenomena can significantly disturb
the bow shock and the magnetosphere-ionosphere system. Recent observations have
also demonstrated that foreshock transients can accelerate particles which,
when transported earthward, can affect space weather. Understanding the
potential of foreshock transients to accelerate particles can help us
understand shock acceleration at Earth and at other planetary and astrophysical
systems. To further investigate foreshock transients' potential for
acceleration we conduct a statistical study of ion and electron energization in
the core of foreshock transients. We find that electron energies typically
increase there, evidently due to an internal acceleration process, whereas, as
expected, ion energies most often decrease to support transient formation and
expansion. Nevertheless, ion energy enhancements can be seen in some events
suggesting an internal ion acceleration process as well. Formation conditions
of foreshock transients are related to weak solar wind magnetic field strength
and fast solar wind speed. Ion and electron energization are also positively
correlated with solar wind speed.

22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
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The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th