Please use this identifier to cite or link to this item: https://repositorio.ufba.br/handle/ri/6294
metadata.dc.type: Artigo de Periódico
Title: Atmospheric effects on extensive air showers observed with the surface detector of the Pierre Auger observatory
Other Titles: Astroparticle Physics
Authors: Abraham, J.
Caruso, R.
De Domenico, M.
Insolia, A.
Pepe, Iuri Muniz
metadata.dc.creator: Abraham, J.
Caruso, R.
De Domenico, M.
Insolia, A.
Pepe, Iuri Muniz
Abstract: Atmospheric parameters, such as pressure (P), temperature (T) and density (ρ∝P/T), affect the development of extensive air showers initiated by energetic cosmic rays. We have studied the impact of atmospheric variations on extensive air showers by means of the surface detector of the Pierre Auger Observatory. The rate of events shows a ∼10% seasonal modulation and ∼2% diurnal one. We find that the observed behaviour is explained by a model including the effects associated with the variations of P and ρ. The former affects the longitudinal development of air showers while the latter influences the Molière radius and hence the lateral distribution of the shower particles. The model is validated with full simulations of extensive air showers using atmospheric profiles measured at the site of the Pierre Auger Observatory.
Keywords: Extensive air showers
UHECR
Atmosphere
Weather
Publisher: Elsevier
URI: http://www.repositorio.ufba.br/ri/handle/ri/6294
Issue Date: Sep-2009
Appears in Collections:Artigo Publicado em Periódico (FIS)

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