Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic fields in our Galaxy: How much do we know? III. Progress in the
  last decade   A decade ago, there was very limited knowledge of magnetic fields of our
Galaxy. The local fields in the Solar vicinity were known to be directed
towards a Galactic longitude $l\sim~90^{\circ}$ with reversed directions at
smaller Galacto-radii. The regular field strength was found to be about
2~$\mu$G. The filaments near the Galactic Center show the possible poloidal
fields there. There was no information about the magnetic fields in the
Galactic halo. In last decade, there has been significant progress on
measurements of the Galactic magnetic fields. In the Galactic disk, from the
RMs of a large number of newly observed pulsars, large-scale magnetic fields
along the spiral arms have been delineated in a much larger region then ever
before, with alternating directions in the arm and interarm regions. The
toroidal fields in the Galactic halo were revealed to have opposite directions
below and above the Galactic plane, which is an indication of A0 dynamo
operating in the halo. The strength of large-scale fields also has been found
from pulsar RM data to exponentially increase at smaller Galacto-radii.
Compared to the steep Kolmogorov spectrum of magnetic energy at small scales,
the large-scale magnetic fields show a shallow broken spatial magnetic energy
spectrum.

30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th