Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The South Atlantic Magnetic Field Anomaly and Its Effect on the
  Calculated Production of Atmospheric Neutrinos   The theoretical calculations of the production of neutrinos via cosmic rays
incident upon the earth's atmosphere (Barr et al., 1989; Becker-Szendy et al.,
1992; Bugaev & Naumov, 1989; Gaisser et al, 1988; Honda et al., 1995) are
examined. These calculations use a one-dimensional approximation in the
production, transport, and decay of the produced particles. Examined are
various additional effects of the earth's magnetic field and the
three-dimensional nature of the problem which have the effect of decreasing the
calulated ratio of muon neutrinos to electron neutrinos.

9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math