Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermomagnetic instability in hot discs   A linear stability analysis of ionized discs with a temperature gradient and
an external axial magnetic field is presented. It is shown that both
hydromagnetic and thermomagnetic effects can lead to the amplification of waves
and make discs unstable. The conditions under which the instabilities grow are
found and the characteristic growth rate is calculated. The regimes at which
both the thermomagnetic and magnetorotational instabilities can operate are
discussed.

0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph