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The TeV-scale cosmic ray proton and helium spectra: Contributions from the local sources

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Abstract

Recent measurements of cosmic ray proton and helium spectra show a hardening above a few hundreds of GeV. This excess is hard to understand in the framework of the conventional models of galactic cosmic ray production and propagation. Here, we propose to explain this anomaly by the presence of local sources. Cosmic ray propagation is described as a diffusion process taking place inside a two-zone magnetic halo. We calculate the proton and helium fluxes at the Earth between 50 GeV and 100 TeV. Improving over a similar analysis, we consistently derive these fluxes by taking into account both local and remote sources for which a unique injection rate is assumed. We find cosmic ray propagation parameters for which the proton and helium spectra remarkably agree with the PAMELA and CREAM measurements over four decades in energy.

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Acknowledgements

YYK is grateful to the organizers for the invitation to attend the UNICOS 2014 workshop. YYK would also like to thank LAPTh at Annecy in France for the warm hospitality he received during his visit. His work is partially supported by the Research Professorship (A) of Ewha Womans University during 2010–2011 and by the Basic Science Research Programme through the National Research Foundation of Korea (NRF) funded by the Korean Ministry of Education, Science and Technology (Grant No. 0409-20140077) and International Cooperation Research Programme funded by the Korean Ministry of Science, ICT and Future Planning (Grant No. 0409-20130159).

PS expresses his gratitude to the Institut Universitaire de France (IUF) for academically and financially supporting his research.

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Authors and Affiliations

  1. Institute of Basic Science, Seoul National University, 1 Kwan-Ak-Ro, Kwan-Ak-Gu, Seoul, Republic of Korea

    YONG-YEON KEUM

  2. LAPTH, Université de Savoie, CNRS, 9 chemin de Bellevue, BP110, F-74941, Annecy-le-Vieux Cedex, France

    PIERRE SALATI

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Correspondence to YONG-YEON KEUM.

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KEUM, YY., SALATI, P. The TeV-scale cosmic ray proton and helium spectra: Contributions from the local sources. Pramana - J Phys 86, 369–377 (2016). https://doi.org/10.1007/s12043-015-1157-7

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  • DOI: https://doi.org/10.1007/s12043-015-1157-7

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