Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinetic Turbulence in Astrophysical Plasmas: Waves and/or Structures?   The question of the relative importance of coherent structures and waves has
for a long time attracted a great deal of interest in astrophysical plasma
turbulence research, with a more recent focus on kinetic scale dynamics. Here
we utilize high-resolution observational and simulation data to investigate the
nature of waves and structures emerging in a weakly collisional, turbulent
kinetic plasma. Observational results are based on in situ solar wind
measurements from the Cluster and MMS spacecraft, and the simulation results
are obtained from an externally driven, three-dimensional fully kinetic
simulation. Using a set of novel diagnostic measures we show that both the
large-amplitude structures and the lower-amplitude background fluctuations
preserve linear features of kinetic Alfven waves to order unity. This
quantitative evidence suggests that the kinetic turbulence cannot be described
as a mixture of mutually exclusive waves and structures but may instead be
pictured as an ensemble of localized, anisotropic wave packets or "eddies" of
varying amplitudes, which preserve certain linear wave properties during their
nonlinear evolution.

30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
2
The categories of this paper are: math
19
The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg