The shape of the radio wavefront of extensive air showers as measured with LOFAR

Corstanje A, Schellart P, Nelles A, Buitink S, Enriquez JE, Falcke H, Frieswijk W, Horandel JR, Krause M, Rachen JP, Scholten O, et al. (2015)
Astroparticle Physics 61: 22-31.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
Extensive air showers, induced by high energy cosmic rays impinging on the Earth's atmosphere, produce radio emission that is measured with the LOFAR radio telescope. As the emission comes from a finite distance of a few kilometers, the incident wavefront is non-planar. A spherical, conical or hyperbolic shape of the wavefront has been proposed, but measurements of individual air showers have been inconclusive so far. For a selected high-quality sample of 161 measured extensive air showers, we have reconstructed the wavefront by measuring pulse arrival times to sub-nanosecond precision in 200 to 350 individual antennas. For each measured air shower, we have fitted a conical, spherical, and hyperboloid shape to the arrival times. The fit quality and a likelihood analysis show that a hyperboloid is the best parameterization. Using a non-planar wavefront shape gives an improved angular resolution, when reconstructing the shower arrival direction. Furthermore, a dependence of the wavefront shape on the shower geometry can be seen. This suggests that it will be possible to use a wavefront shape analysis to get an additional handle on the atmospheric depth of the shower maximum, which is sensitive to the mass of the primary particle. (C) 2014 Elsevier B.V. All rights reserved.
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Astroparticle Physics
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61
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22-31
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Corstanje A, Schellart P, Nelles A, et al. The shape of the radio wavefront of extensive air showers as measured with LOFAR. Astroparticle Physics. 2015;61:22-31.
Corstanje, A., Schellart, P., Nelles, A., Buitink, S., Enriquez, J. E., Falcke, H., Frieswijk, W., et al. (2015). The shape of the radio wavefront of extensive air showers as measured with LOFAR. Astroparticle Physics, 61, 22-31. doi:10.1016/j.astropartphys.2014.06.001
Corstanje, A., Schellart, P., Nelles, A., Buitink, S., Enriquez, J. E., Falcke, H., Frieswijk, W., Horandel, J. R., Krause, M., Rachen, J. P., et al. (2015). The shape of the radio wavefront of extensive air showers as measured with LOFAR. Astroparticle Physics 61, 22-31.
Corstanje, A., et al., 2015. The shape of the radio wavefront of extensive air showers as measured with LOFAR. Astroparticle Physics, 61, p 22-31.
A. Corstanje, et al., “The shape of the radio wavefront of extensive air showers as measured with LOFAR”, Astroparticle Physics, vol. 61, 2015, pp. 22-31.
Corstanje, A., Schellart, P., Nelles, A., Buitink, S., Enriquez, J.E., Falcke, H., Frieswijk, W., Horandel, J.R., Krause, M., Rachen, J.P., Scholten, O., ter Veen, S., Thoudam, S., Trinh, T.N.G., van den Akker, M., Alexov, A., Anderson, J., Avruch, I.M., Bell, M.E., Bentum, M.J., Bernardi, G., Best, P., Bonafede, A., Breitling, F., Broderick, J., Bruegen, M., Butcher, H.R., Ciardi, B., de Gasperin, F., de Geus, E., de Vos, M., Duscha, S., Eisloeffel, J., Engels, D., Fallows, R.A., Ferrari, C., Garrett, M.A., Griessmseier, J., Gunst, A.W., Hamaker, J.P., Hoeft, M., Homeffer, A., Icobelli, M., Juette, E., Karastergiou, A., Kohler, J., Kondratiev, V.I., Kuniyoshi, M., Kuper, G., Maat, P., Mann, G., McFadden, R., McKay-Bukowski, D., Mevius, M., Munk, H., Norden, M.J., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V.N., Pizzo, R., Polatidis, A.G., Reich, W., Rottgering, H., Scaife, A.M.M., Schwarz, D., Smirnov, O., Stewart, A., Steinmetz, M., Swinbank, J., Tagger, M., Tang, Y., Tasse, C., Toribio, C., Vermeulen, R., Vocks, C., van Weeren, R.J., Wijnholds, S.J., Wucknitz, O., Yatawatta, S., Zarka, P.: The shape of the radio wavefront of extensive air showers as measured with LOFAR. Astroparticle Physics. 61, 22-31 (2015).
Corstanje, A., Schellart, P., Nelles, A., Buitink, S., Enriquez, J. E., Falcke, H., Frieswijk, W., Horandel, J. R., Krause, M., Rachen, J. P., Scholten, O., ter Veen, S., Thoudam, S., Trinh, T. N. G., van den Akker, M., Alexov, A., Anderson, J., Avruch, I. M., Bell, M. E., Bentum, M. J., Bernardi, G., Best, P., Bonafede, A., Breitling, F., Broderick, J., Bruegen, M., Butcher, H. R., Ciardi, B., de Gasperin, F., de Geus, E., de Vos, M., Duscha, S., Eisloeffel, J., Engels, D., Fallows, R. A., Ferrari, C., Garrett, M. A., Griessmseier, J., Gunst, A. W., Hamaker, J. P., Hoeft, M., Homeffer, A., Icobelli, M., Juette, E., Karastergiou, A., Kohler, J., Kondratiev, V. I., Kuniyoshi, M., Kuper, G., Maat, P., Mann, G., McFadden, R., McKay-Bukowski, D., Mevius, M., Munk, H., Norden, M. J., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V. N., Pizzo, R., Polatidis, A. G., Reich, W., Rottgering, H., Scaife, A. M. M., Schwarz, Dominik, Smirnov, O., Stewart, A., Steinmetz, M., Swinbank, J., Tagger, M., Tang, Y., Tasse, C., Toribio, C., Vermeulen, R., Vocks, C., van Weeren, R. J., Wijnholds, S. J., Wucknitz, O., Yatawatta, S., and Zarka, P. “The shape of the radio wavefront of extensive air showers as measured with LOFAR”. Astroparticle Physics 61 (2015): 22-31.

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