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Calibration of the LOFAR low-band antennas using the Galaxy and a model of the signal chain
Vrije Univ Brussel, Belgium.
Radboud Univ Nijmegen, Netherlands.
Vrije Univ Brussel, Belgium;Radboud Univ Nijmegen, Netherlands.
Radboud Univ Nijmegen, Netherlands.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 111, s. 1-11Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The LOw-Frequency ARray (LOFAR) is used to make precise measurements of radio emission from extensive air showers, yielding information about the primary cosmic ray. Interpreting the measured data requires an absolute and frequency-dependent calibration of the LOFAR system response. This is particularly important for spectral analyses, because the shape of the detected signal holds information about the shower development. We revisit the calibration of the LOFAR antennas in the range of 30-80 MHz. Using the Galactic emission and a detailed model of the LOFAR signal chain, we find an improved calibration that provides an absolute energy scale and allows for the study of frequency dependent features in measured signals. With the new calibration, systematic uncertainties of 13% are reached, and comparisons of the spectral shape of calibrated data with simulations show promising agreement. (C) 2019 Elsevier B.V. All rights reserved.

sted, utgiver, år, opplag, sider
Elsevier, 2019. Vol. 111, s. 1-11
Emneord [en]
Radio antenna array, Calibration, Air showers
HSV kategori
Forskningsprogram
Fysik, Astropartikelfysik
Identifikatorer
URN: urn:nbn:se:lnu:diva-85846DOI: 10.1016/j.astropartphys.2019.03.004ISI: 000470047300001Scopus ID: 2-s2.0-85063297167OAI: oai:DiVA.org:lnu-85846DiVA, id: diva2:1330234
Tilgjengelig fra: 2019-06-25 Laget: 2019-06-25 Sist oppdatert: 2019-08-29bibliografisk kontrollert

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Thoudam, Satyendra

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