Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interstellar Turbulence I: Observations and Processes   This two-part review summarizes interstellar turbulence and its implications.
The first part begins with diagnostics and energy sources. Turbulence theory is
considered in detail, including the basic fluid equations, solenoidal and
compressible modes, global inviscid quadratic invariants, scaling arguments,
energy transfer and cascade, velocity probability distributions, and turbulent
pressure. Theories of magnetohydrodynamic turbulence, including collisionless
MHD turbulence, are discussed, emphasizing various proposals for energy
spectra. A large variety of numerical simulations of interstellar turbulence
are reviewed. Models have reproduced many of the basic features of the observed
scaling relations, predicted fast decay rates for supersonic MHD turbulence,
and derived probability distribution functions for density. Thermal
instabilities and thermal phases have a new interpretation in a turbulent
medium. Large-scale models with various combinations of self-gravity, magnetic
fields, supernovae, and star formation are beginning to resemble the observed
interstellar medium in morphology and statistical properties. The role of
self-gravity in turbulent gas is clarified, leading to new paradigms for the
formation of star clusters, the stellar mass function, the origin of stellar
rotation and binary stars, and the effects of magnetic fields.

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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph