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Conference: Bucharest University Faculty of Physics 2019 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Closer look on cosmic rays induced air showers properties and characteristics of the emitted radio signals using analytical approaches and full Monte Carlo simulations synthesized into a browser.

Authors:

Paula Gina ISAR (1), Dragos HIRNEA (1, 2), Alexandru JIPA (2)

Affiliation:

1) Institute of Space Science (ISS), Bucharest-Magurele, Romania

2) University of Bucharest, Faculty of Physics, Bucharest-Magurele, Romania

E-mail

gina.isar@spacescience.ro, dragos.hirnea@spacescience.ro, jipa@brahms.fizica.unibuc.ro

Keywords:

cosmic rays, air showers, radio emission, graphical user interface

Abstract:

Cosmic rays have been a hot topic for the Astroparticle Physics community, since discovered in 1912. After over a century and many efforts from scientists worldwide we know now that the most energetic particles observed on Earth, the ultra-high energy cosmic rays (UHECRs), have an extragalactic source. Where, how and what exactly accelerates them? These questions remain still mysterious nowadays. The extensive air showers (EAS) developed by cosmic rays (CRs) in the Earth’s atmosphere are at this moment the most resourceful subject of study for researchers who make efforts to better understand these fascinating particles. However, the detection and study of EAS is not at all an easy task. Because the Earth’s atmosphere is being used as a giant detector of cosmic rays, EAS develop differently based on primary particle energy and mass, incoming direction and atmospheric environment at a given detector location. In this paper we look at the development of EAS from two different, but complementary perspectives. First, we show how the main parameters of the showers modify, as function of the primary properties, by multiple longitudinal profiles simulated with CONEX, for different sets of CR parameters (energy, mass, direction of propagation). Next, we look at the radio signals emitted by EAS, which develop at the Pierre Auger Observatory location, by using a simplified VXB model to describe the geomagnetic emission, and sophisticated simulations with the CoREAS option in the CORSIKA Monte Carlo code, who treat the full radio emission released by an air shower. Some of the results presented in this paper are included in an open source graphical user interface (GUI) application, EAS Browser v2.0.

References:

1. Aab, A.; ... Isar P.G. et al. Pierre Auger Coll., Observation of a large-scale anisotropy in the arrival direction of cosmic rays above 8x1018 eV, Science 357 (2017) 1266

2. Huege, T., Falcke, H., Radio emission from cosmic rays air showers – Coherent geosynchrotron radiation, A&A 412 (2003) 19-34

3. Isar, P. G.; Apel, W. D.; Arteaga, J. C.; et al. the LOPES Coll., Radio emission of energetic cosmic ray air showers: Polarization measurements with LOPES, Nucl. Instr. Meth. A., 604 (2009) S81

4. Isar, P. G., Polarization Measurements of Radio Emission of Cosmic Ray Air Showers with LOPES, PhD Thesis, Karlsruhe Institute of Technology (2010)

5. Revenu, B. for the Pierre Auger Coll., Autonomous detection and analysis of radio emission from air showers at the Pierre Auger Observatory, 32 ICRC, 2011

6. Schoorlemmer, H. for the Pierre Auger Coll., Results from polarization studies of radio signals induced by cosmic rays at the Pierre Auger Observatory, Nucl. Instr. Meth. A., 662 (2012) S134

7. Aab, A.; ... Isar P.G. et al. Pierre Auger Coll., Probing the radio emission from cosmic-ray-induced air showers by polarization measurements, PHYSICAL REVIEW D 89 (2014) 052002

8. Bergmann, T. et al., One-dimensional hybrid approach to extensive air shower simulation, Astropart. Phys. 26 (2007) 420

9. Pierog, T. et al., First Results of Fast One-dimensional Hybrid Simulation of EAS Using CONEX, Nucl. Phys. Proc. Suppl.151 (2006) 159

10. Huege, T. CoREAS 1.0 User’s Manual, 2013: https://web.ikp.kit.edu/huege/downloads/coreas-1.0-manual.pdf

11. Schröder, F. G., Radio detection of Cosmic-Ray Air Showers and High-Energy Neutrinos, Progress in Particle and Nuclear Physics 93 (2017)

12. An EAS Browser Display: https://easbrowser.wordpress.com

Acknowledgement:

This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CNCS/CCCDI - UEFISCDI, project number PN-III-P1-1.2-PCCDI-2018-0839, within PNCDI III.