Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Enigma of Saturn's North-Polar Hexagon   It has been suggested that the north-polar hexagon found on Saturn is an
unusual Rossby wave. If this is to be the case, one must not only explain how a
Rossby wave can be hexagonal in shape, albeit with curved corners, but also why
it is hexagonal rather than in the form of some other polygon. It is likely
that a spectrum of Rossby waves with different amplitudes and wavelengths
resulting from the velocity profile of the hexagonal jet is responsible for its
shape.

20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom