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 δ <1.9% and δ <0.5% at the 95% C.I. has been obtained for positrons and electrons, respectively. For protons, helium, carbon and oxygen, upper limits of δ <0.38%, δ <0.36%, δ <1.9% and δ <1.7% at the 95% C.I. have been obtained for rigidities above 200 GV.
Casaus, J., Mana, C., Molero, M., Velasco, M., Gebauer, I., Graziani, M., et al. (2020). Anisotropy of cosmic ray fluxes measured with AMS-02 on the ISS. In Proceedings of Science (pp.1-6). Sissa Medialab Srl [10.22323/1.364.0045].
Anisotropy of cosmic ray fluxes measured with AMS-02 on the ISS
la Vacca G.;Gervasi M.;
2020
Abstract
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 δ <1.9% and δ <0.5% at the 95% C.I. has been obtained for positrons and electrons, respectively. For protons, helium, carbon and oxygen, upper limits of δ <0.38%, δ <0.36%, δ <1.9% and δ <1.7% at the 95% C.I. have been obtained for rigidities above 200 GV.
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