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The effect of the atmospheric refractive index on the radio signal of extensive air showers using Global Data Assimilation System (GDAS)

Corstanje, A. (author)
Radboud University, Netherlands
Mitra, P. (author)
Vrije Universiteit, Belgium
Bonardi, A. (author)
Radboud University, Netherlands
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Buitink, S. (author)
Vrije Universiteit, Belgium
Falcke, H. (author)
Radboud University, Netherlands;NIKHEF, Netherlands;Netherlands Institute of Radio Astronomy (ASTRON), Netherlands
Hare, B. M. (author)
University Groningen, Netherlands
Hörandel, J. R. (author)
Radboud University, Netherlands;NIKHEF, Netherlands
Mulrey, K. (author)
Vrije Universiteit, Belgium
Nelles, A. (author)
Radboud University, Netherlands;University of California, USA
Rachen, J. P. (author)
Radboud University, Netherlands
Rossetto, L. (author)
Radboud University, Netherlands
Schellart, P. (author)
Radboud University, Netherlands;Princeton University, USA
Scholten, O. (author)
University Groningen, Netherlands
Ter Veen, S. (author)
Radboud University, Netherlands;Netherlands Institute of Radio Astronomy (ASTRON), Netherlands
Thoudam, Satyendra (author)
Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE),Radboud University, Netherlands
Trinh, T. N. G. (author)
University Groningen, Netherlands
Winchen, T. (author)
Vrije Universiteit, Belgium
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 (creator_code:org_t)
Sissa Medialab Srl, 2018
2018
English.
In: 35th International Cosmic Ray Conference, ICRC 2017, 10-20 July 2017, Bexco, Busan, Korea. - : Sissa Medialab Srl.
  • Conference paper (peer-reviewed)
Abstract Subject headings
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  • One of the major systematic uncertainties in the measurement of Xmax from radio emission of EAS arises from variations of the refractive index in the atmosphere. The refractive index n varies with temperature, humidity and pressure, and the variations can be on the order of 10% for (n-1) at a given altitude. The effect of a varying refractive index on Xmax measurements is evaluated using CoREAS: a microscopic simulation of the radio emission from the individual particles in the cascade simulated with CORSIKA. We discuss the resulting offsets in Xmax for different frequency regimes, and compare them to a simple physical model. Under typical circumstances, the offsets in Xmax range from 4-11 g/cm2 for the 30-80 MHz frequency band. Therefore, for precise measurements it is required to include atmospheric data at the time and place of observation of the air shower into the simulations. The aim is to implement this in the next version of CoREAS/CORSIKA using the Global Data Assimilation System (GDAS), a global atmospheric model based on meteorological measurements and numerical weather predictions. This can then be used to re-evaluate the air shower measurements of the LOFAR radio telescope. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

Atmospheric humidity
Cosmic rays
Cosmology
Uncertainty analysis
Atmospheric refractive index
Global atmospheric models
Global data assimilation system
Meteorological measurements
Numerical weather prediction
Simple Physical Models
Systematic uncertainties
Varying refractive index
Refractive index
Astroparticle Physics
Astropartikelfysik

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