Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impact of atmospheric effects on the energy reconstruction of air
  showers observed by the surface detectors of the Pierre Auger Observatory   Atmospheric conditions, such as the pressure (P), temperature (T) or air
density ($\rho \propto P/T$), affect the development of extended air showers
initiated by energetic cosmic rays. We study the impact of the atmospheric
variations on the reconstruction of air showers with data from the arrays of
surface detectors of the Pierre Auger Observatory, considering separately the
one with detector spacings of 1500 m and the one with 750 m spacing. We observe
modulations in the event rates that are due to the influence of the air density
and pressure variations on the measured signals, from which the energy
estimators are obtained. We show how the energy assignment can be corrected to
account for such atmospheric effects.

29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph