Electron and Positron Fluxes in Primary Cosmic Rays measured with the\n Alpha Magnetic Spectrometer on the International Space Station

2017/01/25 by M. Graziani, Graziani, Maura
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Solar and Space Plasma Dynamics

paper · pdf · doi:10.48550/arxiv.1701.07305

openalex publication_date 2017/01/25 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28

Abstract

Precision measurements by the Alpha Magnetic Spectrometer (AMS-02) on the\nInternational Space Station of the primary cosmic-ray electron flux and the\npositron flux will be discussed. The electron flux and the positron flux each\nrequire a description beyond a single power-law spectrum. Both the electron\nflux and the positron flux change their behavior at ~30 GeV but the fluxes are\nsignificantly different in their magnitude and energy dependence. Between 20\nand 200 GeV the positron spectral index is significantly harder than the\nelectron spectral index. The determination of the different behavior of the\nspectral indices versus energy is a new observation and provides important\ninformation on the origins of cosmic-ray electrons and positrons.\n

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