We present high-statistics, precision measurements by AMS of the detailed time and rigidity dependence of the primary cosmic-ray electron, positron, proton and helium fluxes over 79 Bartels rotations from May 2011 to May 2017 in the energy range from 1 to 50 GeV. For the first time, the charge-sign dependent modulation during solar maximum has been investigated in detail by leptons alone. We report the observation of short-term structures on the timescale of months coincident in all the fluxes. These structures are not visible in the positron-to-electron flux ratio. The precision measurements across the solar polarity reversal show that the ratio exhibits a smooth transition over ∼800 days from one value to another.
Rozza, D. (2019). Observation of complex time structures in the cosmic ray fluxes by 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.
Observation of complex time structures in the cosmic ray fluxes by the alpha magnetic spectrometer on the ISS
Rozza D.
Primo
2019
Abstract
We present high-statistics, precision measurements by AMS of the detailed time and rigidity dependence of the primary cosmic-ray electron, positron, proton and helium fluxes over 79 Bartels rotations from May 2011 to May 2017 in the energy range from 1 to 50 GeV. For the first time, the charge-sign dependent modulation during solar maximum has been investigated in detail by leptons alone. We report the observation of short-term structures on the timescale of months coincident in all the fluxes. These structures are not visible in the positron-to-electron flux ratio. The precision measurements across the solar polarity reversal show that the ratio exhibits a smooth transition over ∼800 days from one value to another.
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