Anisotropy of Protons and Light Primary Nuclei in Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the ISS
October 31, 2022
June 15, 2023
A measurement of the cosmic ray anisotropy on the arrival directions of protons and light primary nuclei helium, carbon, and oxygen has been performed in galactic coordinates by the Alpha Magnetic Spectrometer onboard the International Space Station. The analysis is based on the first 10 years of data taking. Results are consistent with isotropy for the different species and upper limits on the dipole amplitude ($\delta$) at the 95$\%$ C.I. have been established. In particular, for rigidities above 200 GV limits of $\delta$ < 0.30$\%$, $\delta$ < 0.30$\%$, $\delta$ < 1.41$\%$, and $\delta$ < 1.73$\%$ are obtained for protons, helium, carbon and oxygen respectively.
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