The emission of radio waves from air showers has been attributed to the so-called geomagnetic emission process. At frequencies around 50 MHz this process leads to coherent radiation which can be observed with rather simple setups. The direction of the electric field induced by this emission process depends only on the local magnetic field vector and on the incoming direction of the air shower. We report on measurements of the electric field vector where, in addition to this geomagnetic component, another component has been observed that cannot be described by the geomagnetic emission process. The data provide strong evidence that the other electric field component is polarized radially with respect to the shower axis, in agreement with predictions made by Askaryan who described radio emission from particle showers due to a negative charge excess in the front of the shower. Our results are compared to calculations which include the radiation mechanism induced by this charge-excess process. © 2014 American Physical Society.
Documento: | Artículo |
Título: | Probing the radio emission from air showers with polarization measurements |
Autor: | Multitudinario:496 |
Filiación: | Universität Siegen, Siegen, Germany LIP and Instituto Superior Técnico, Technical University of Lisbon, Portugal Osservatorio Astrofisico di Torino (INAF), Università di Torino, Sezione INFN, Torino, Italy University of Wisconsin, Madison, WI, United States Fermilab, Batavia, IL, United States Instituto de Física, Universidade de São Paulo, São Paulo, SP, Brazil Centro Atómico Bariloche, Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, Argentina New York University, New York, NY, United States Ohio State University, Columbus, OH, United States Universidad Tecnológica, Nacional-Facultad Regional Buenos Aires, Buenos Aires, Argentina Instituto de Tecnologías en Detección y Astropartí culas, CNEA, CONICET, Buenos Aires, Argentina Universidad Nacional Autonoma de Mexico, Distrito Federal, Mexico Universidad de Santiago de Compostela, Spain Universität Hamburg, Hamburg, Germany Università di Napoli Federico II, Sezione INFN, Napoli, Italy IMAPP, Radboud University, Nijmegen, Netherlands University of Wisconsin, Milwaukee, WI, United States Rudjer Bošković Institute, 10000 Zagreb, Croatia Universidad Complutense de Madrid, Madrid, Spain Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3 Paris, France Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier Grenoble, CNRS-IN2P3 Grenoble INP, France Observatorio Pierre Auger and Comisión Nacional de Energía Atómica, Malargüe, Argentina University Politehnica of Bucharest, Romania University of Adelaide, Adelaide, SA, Australia Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris 11, CNRS-IN2P3 Orsay, France Karlsruhe Institute of Technology, Campus North-Institut für Kernphysik, Karlsruhe, Germany Karlsruhe Institute of Technology-Campus South, Institut für Experimentelle Kernphysik (IEKP), Karlsruhe, Germany University of Nebraska, Lincoln, NE, United States Bergische Universität Wuppertal, Wuppertal, Germany Los Alamos National Laboratory, Los Alamos, NM, United States Max-Planck-Institut für Radioastronomie, Bonn, Germany Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic INFN, Laboratori Nazionali Del Gran Sasso, Assergi (l'Aquila), Italy Universidade Federal Do Rio de Janeiro, Instituto de Física, Rio de Janeiro, Brazil Institute of Nuclear Physics PAN, Krakow, Poland Colorado State University, Fort Collins, CO, United States 'Horia Hulubei' National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, Romania Colorado State University, Pueblo, CO, United States Universidad de Granada and C.A.F.P.E., Granada, Spain Pennsylvania State University, University Park, United States Università di Milano, Sezione INFN, Milan, Italy Università di Roma II Tor Vergata, Sezione INFN, Roma, Italy Università di Catania, Sezione INFN, Catania, Italy Dipartimento di Matematica e Fisica E. de Giorgi, Università Del Salento, Sezione INFN, Lecce, Italy Università di Torino, Sezione INFN, Torino, Italy Universidade Estadual de Campinas, IFGW, Campinas, Sao Paulo, Brazil Observatorio Pierre Auger, Malargüe, Argentina Case Western Reserve University, Cleveland, OH, United States Enrico Fermi Institute, University of Chicago, Chicago, IL, United States SUBATECH, École des Mines de Nantes, Université de Nantes, Nantes, France Station de Radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU Nançay, France Instituto de Astronomía y Física Del Espacio (CONICET-UBA), Buenos Aires, Argentina Departamento de Física, FCEyN, Universidad de Buenos Aires y CONICET, Argentina Universidade Federal Fluminense, EEIMVR, Volta Redonda, Rio de Janeiro, Brazil Nikhef, Science Park, Amsterdam, Netherlands Instituto de Tecnologías en Detección y Astropartí culas, CNEA, National Technological University, Mendoza, Argentina Universidade de São Paulo, Instituto de Física, São Carlos, São Paulo, Brazil Kernfysisch Versneller Instituut, University of Groningen, Groningen, Netherlands Universidad de Alcalá, Alcalá de Henares, Spain Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris 11, CNRS-IN2P3 Orsay, France Michigan Technological University, Houghton, MI, United States Università dell'Aquila, INFN, L'Aquila, Italy Northeastern University, Boston, MA, United States Centro Brasileiro de Pesquisas Fisicasl, Rio de Janeiro, Rio de Janeiro, Brazil Institute for Nuclear Science and Technology (INST), Hanoi, Viet Nam IFLP, Universidad Nacional de la Plata, CONICET, La Plata, Argentina RWTH Aachen University III, Physikalisches Institut A, Aachen, Germany ASTRON, Dwingeloo, Netherlands University of Bucharest, Physics Department, Romania Argonne National Laboratory, Argonne, IL, United States J. Stefan Institute, Ljubljana, Slovenia Laboratory for Astroparticle Physics, University of Nova Gorica, Slovenia University of Hawaii, Honolulu, HI, United States Dipartimento di Fisica dell'Università, INFN, Genova, Italy Karlsruhe Institute of Technology-Campus, North-Institut für Prozessdatenverarbeitung und Elektronik, Germany University of Łódź, Łódź, Poland Universidade Federal da Bahia, Salvador, British Airways, Brazil Universidade Estadual de Feira de Santana, Brazil Palacky University, RCPTM, Olomouc, Czech Republic Institute of Space Sciences, Bucharest, Romania Charles University, Faculty of Mathematics and Physics, Institute of Particle and Nuclear Physics, Prague, Czech Republic Louisiana State University, Baton Rouge, Los Angeles, United States School of Physics and Astronomy, University of Leeds, United Kingdom Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (INAF), Palermo, Italy University of New Mexico, Albuquerque, NM, United States Faculdade Independente Do Nordeste, Vitória da Conquista, Brazil Universidade Federal Do ABC, Santo André, Sao Paulo, Brazil Benemérita Universidad Autónoma de Puebla, Mexico Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Centro de Investigación y de Estudios Avanzados Del IPN (CINVESTAV), México, Distrito Federal, Mexico Colorado School of Mines, Golden, CO, United States Instituto de Física de Rosario (IFIR)-CONICET/U.N.R., Facultad de Ciencias Bioquímicas y Farmacéuticas U.N.R., Rosario, Argentina Centro de Investigaciones en Láseres y Aplicaciones, CITEDEF, CONICET, Argentina Institut de Física Corpuscular, CSIC-Universitat de vale'Ncia, Valencia, Spain |
Año: | 2014 |
Volumen: | 89 |
Número: | 5 |
DOI: | http://dx.doi.org/10.1103/PhysRevD.89.052002 |
Título revista: | Physical Review D - Particles, Fields, Gravitation and Cosmology |
Título revista abreviado: | Phys Rev D Part Fields Gravit Cosmol |
ISSN: | 15507998 |
CODEN: | PRVDA |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v89_n5_p_Multitudinario |