Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relative contribution of the magnetic field barrier and solar wind speed
  in ICME-associated Forbush decreases   We study 50 cosmic ray Forbush decreases (FDs) from the Oulu neutron monitor
data during 1997-2005 that were associated with Earth-directed interplanetary
coronal mass ejections (ICMEs). Such events are generally thought to arise due
to the shielding of cosmic rays by a propagating diffusive barrier. The main
processes at work are the diffusion of cosmic rays across the large-scale
magnetic fields carried by the ICME and their advection by the solar wind. In
an attempt to better understand the relative importance of these effects, we
analyse the relationship between the FD profiles and those of the
interplanetary magnetic field (B) and the solar wind speed (Vsw). Over the
entire duration of a given FD, we find that the FD profile is generally well
(anti)correlated with the B and Vsw profiles. This trend holds separately for
the FD main and recovery phases too. For the recovery phases, however, the FD
profile is highly anti-correlated with the Vsw profile, but not with the B
profile. While the total duration of the FD profile is similar to that of the
Vsw profile, it is significantly longer than that of the B profile.

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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: stat