Atmospheric effects on extensive air showers observed with the Surface Detector of the Pierre Auger Observatory

Abraham, J.

doi:10.1016/j.astropartphys.2009.06.004

Atmospheric effects on extensive air showers observed with the Surface Detector of the Pierre Auger Observatory

Journal Article · Mon Jun 01 04:00:00 EDT 2009 · Astropart.Phys.

DOI:https://doi.org/10.1016/j.astropartphys.2009.06.004· OSTI ID:1872453

Abraham, J.

Atmospheric parameters, such as pressure (P), temperature (T) and density, 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 pressure and density. The former affects the longitudinal development of air showers while the latter influences the Moliere 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.

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: Pierre Auger

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1872453

Report Number(s):: FERMILAB-PUB-09-679-AE; arXiv:0906.5497; oai:inspirehep.net:824424

Journal Information:: Astropart.Phys., Journal Name: Astropart.Phys. Vol. 32

Country of Publication:: United States

Language:: English

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