Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From reversing to hemispherical dynamos   We show that hemispherical dynamos can result from weak equatorial symmetry
breaking of the flow in the interior of planets and stars. Using a model of
spherical dynamo, we observe that the interaction between a dipolar and a
quadrupolar mode can localize the magnetic field in only one hemisphere when
the equatorial symmetry is broken. This process is shown to be related to the
one that is responsible for reversals of the magnetic field. These seemingly
very different behaviors are thus understood in a unified framework.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg