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Measurement of the circular polarization in radio emission from extensive air showers confirms emission mechanisms
Univ Groningen, Netherlands ; Vrije Univ Brussel, Belgium.
Univ Groningen, Netherlands.
Radboud Univ Nijmegen, Netherlands.
Vrije Univ Brussel, Belgium.
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2016 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 94, no 10, 103010Article in journal (Refereed) Published
Abstract [en]

We report here on a novel analysis of the complete set of four Stokes parameters that uniquely determine the linear and/or circular polarization of the radio signal for an extensive air shower. The observed dependency of the circular polarization on azimuth angle and distance to the shower axis is a clear signature of the interfering contributions from two different radiation mechanisms, a main contribution due to a geomagnetically-induced transverse current and a secondary component due to the build-up of excess charge at the shower front. The data, as measured at LOFAR, agree very well with a calculation from first principles. This opens the possibility to use circular polarization as an investigative tool in the analysis of air shower structure, such as for the determination of atmospheric electric fields.

Place, publisher, year, edition, pages
2016. Vol. 94, no 10, 103010
National Category
Physical Sciences
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-59036DOI: 10.1103/PhysRevD.94.103010ISI: 000388529000002OAI: oai:DiVA.org:lnu-59036DiVA: diva2:1056884
Available from: 2016-12-15 Created: 2016-12-15 Last updated: 2017-04-12Bibliographically approved

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Thoudam, Satyendra
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Department of Physics and Electrical Engineering
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CiteExportLink to record
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