Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Shear Damped Polar Convective Fluid Instabilities   The influence of the magnetic field shear is studied on the $E\times B$
(and/or Gravitational) and the Current Convective Instabilities (CCI) occuring
in the High latitude F-layer ionosphere. It is shown that magnetic shear
reduces the growth rate of these instabilties. The magnetic shear induced
stabilization is more effective at the larger scale sizes ($\geq$ tens of
kilometers) while at the scintillation causing intermediate scale sizes ($\sim$
a few kms), the growth rate is largely unaffected. The eigen mode structure is
localised about a rational surface due to finite magnetic shear and has broken
reflectional symmetry due to centroid shift of the mode by equilibrium parallel
flow or current.

37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg