A measurement of the dipole anisotropy in galactic coordinates for different charged cosmic rays 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 6.5 years for positrons and electrons. All the species are found to be consistent with isotropy and upper limits to the dipole amplitude have been computed. In particular, for energies above 16 GeV a limit of δ < 1.9% and δ < 0.5% at the 95% C.I. is found for positrons and electrons respectively. For rigidities above 200 GV a limit of δ < 0.38%, δ < 0.36%, δ < 1.9% and δ < 1.7% is obtained for protons, Helium, Carbon and Oxygen.
Molero, M., Casaus, J., Mana, C., Velasco, M., Gebauer, I., Graziani, M., et al. (2019). Anisotropy of cosmic ray fluxes measured with the alpha magnetic spectrometer on the ISS. In Proceedings of the 2019 Meeting of the Division of Particles and Fields of the American Physical Society, DPF 2019. SLAC National Accelerator Laboratory.
Anisotropy of cosmic ray fluxes measured with the alpha magnetic spectrometer on the ISS
Gervasi M.;La Vacca G.;
2019
Abstract
A measurement of the dipole anisotropy in galactic coordinates for different charged cosmic rays 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 6.5 years for positrons and electrons. All the species are found to be consistent with isotropy and upper limits to the dipole amplitude have been computed. In particular, for energies above 16 GeV a limit of δ < 1.9% and δ < 0.5% at the 95% C.I. is found for positrons and electrons respectively. For rigidities above 200 GV a limit of δ < 0.38%, δ < 0.36%, δ < 1.9% and δ < 1.7% is obtained for protons, Helium, Carbon and Oxygen.
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