A measurement of the dipole anisotropy in the arrival directions of galactic cosmic positrons, electrons and protons has been performed with the Alpha Magnetic Spectrometer (AMS) onboard the International Space Station (ISS) using the first 6 years of data. 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 for each cosmic ray species. The results are consistent with isotropy for all three particle species and upper limits on the dipole amplitude have been derived. A 95% C.I. upper limit of δ <0.020 and δ <0.005 has been obtained for positrons and electrons, respectively, in the energy range 16 to 350 GeV, and δ <0.008 for protons for rigidities above 300 GV.
Casaus, J., Mana, C., Molero, M., Velasco, M., Gebauer, I., Graziani, M., et al. (2019). Anisotropy of elementary particle fluxes in primary cosmic rays measured with AMS on the iss. Intervento presentato a: 39th International Conference on High Energy Physics, ICHEP 2018, kor.
Anisotropy of elementary particle fluxes in primary cosmic rays measured with AMS on the iss
la Vacca G.;Gervasi M.;
2019
Abstract
A measurement of the dipole anisotropy in the arrival directions of galactic cosmic positrons, electrons and protons has been performed with the Alpha Magnetic Spectrometer (AMS) onboard the International Space Station (ISS) using the first 6 years of data. 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 for each cosmic ray species. The results are consistent with isotropy for all three particle species and upper limits on the dipole amplitude have been derived. A 95% C.I. upper limit of δ <0.020 and δ <0.005 has been obtained for positrons and electrons, respectively, in the energy range 16 to 350 GeV, and δ <0.008 for protons for rigidities above 300 GV.
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