PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Astroparticle Physics and Gravitational Waves
Anisotropy of Cosmic Ray Fluxes measured with AMS-02 on the ISS
J. Casaus*, C. Maña, M.A. Velasco Frutos, M. Molero, I. Gebauer, M. Graziani, G. La Vacca, M. Gervasi and P.G. Rancoita
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Pre-published on: October 12, 2020
Published on: November 12, 2020
A measurement of the dipole anisotropy in galactic coordinates for individual cosmic ray species has been performed with the Alpha Magnetic Spectrometer (AMS) onboard the International Space Station (ISS). Results are presented for the first 7.5 years of data taking for protons, helium, carbon and oxygen, and for 6.5 years for positrons and electrons. Thanks to its wide field of view and to the inclination of the ISS orbit, AMS provides nearly full sky coverage in galactic coordinates, which allows to determine the three independent dipole components. The results are consistent with isotropy for all particle species and upper limits on the dipole amplitude have been derived. For energies above 16 GeV a limit of $\delta\!<\!1.9\%$ and $\delta\!<\!0.5\%$ at the 95\% C.I. has been obtained for positrons and electrons, respectively. For protons, helium, carbon and oxygen, upper limits of $\delta\!<\!0.38\%$, $\delta\!<\!0.36\%$, $\delta\!<\!1.9\%$ and $\delta\!<\!1.7\%$ at the 95\% C.I. have been obtained for rigidities above 200 GV.
DOI: https://doi.org/10.22323/1.364.0045
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