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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)
Radboud University, The Netherlands.
Vrije Universiteit, Belgium.
Radboud University, The Netherlands.
Vrije Universiteit, Belgium.
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2018 (English)In: 35th International Cosmic Ray Conference, ICRC 2017, 10-20 July 2017, Bexco, Busan, Korea, Sissa Medialab Srl , 2018Conference paper, Published paper (Refereed)
Abstract [en]

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).

Place, publisher, year, edition, pages
Sissa Medialab Srl , 2018.
Series
Proceedings of Science, ISSN 1824-8039 ; 301
Keywords [en]
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
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-85110Scopus ID: 2-s2.0-85046060446OAI: oai:DiVA.org:lnu-85110DiVA, id: diva2:1336970
Conference
35th International Cosmic Ray Conference, ICRC 2017, 10-20 July 2017, Bexco, Busan, Korea
Note

Conference code: 135186; Export Date: 11 June 2019; Conference Paper

Available from: 2019-07-11 Created: 2019-07-11 Last updated: 2019-09-03Bibliographically approved

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Thoudam, Satyendra

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CiteExportLink to record
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Citation style
  • apa
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