Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three Branches of Dynamo Action   In addition to the weak-dipolar state and to the fluctuating-multipolar
state, widely discussed in the literature, a third regime has been identified
in Dormy (2016). It corresponds to a strong-dipolar branch which appears to
approach, in a numerically affordable regime, the magnetostrophic limit
relevant to the dynamics of the Earth's core. We discuss the transitions
between these states and point to the relevance of this strong-dipolar state to
Geodynamo modelling.

1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci