Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Convective, absolute and global azimuthal magnetorotational
  instabilities   We study the convective and absolute forms of azimuthal magnetorotational
instability (AMRI) in a Taylor-Couette (TC) flow with an imposed azimuthal
magnetic field. We show that the domain of the convective AMRI is wider than
that of the absolute AMRI. Actually, it is the absolute instability which is
the most relevant and important for magnetic TC flow experiments. The absolute
AMRI, unlike the convective one, stays in the device, displaying a sustained
growth that can be experimentally detected. We also study the global AMRI in a
TC flow of finite height using DNS and find that its emerging butterfly-type
structure -- a spatio-temporal variation in the form of upward and downward
traveling waves -- is in a very good agreement with the linear stability
analysis, which indicates the presence of two dominant absolute AMRI modes in
the flow giving rise to this global butterfly pattern.

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The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an