Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station

We present high-statistics, precision measurements of the detailed time and energy dependence of the
primary cosmic-ray electron flux and positron flux 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. Based on 23.5 × 106 events, we report the
observation of short-term structures on the timescale of months coincident in both the electron flux and the
positron flux. These structures are not visible in the eþ=e− flux ratio. The precision measurements across
the solar polarity reversal show that the ratio exhibits a smooth transition over 830 30 days from one
value to another. The midpoint of the transition shows an energy dependent delay relative to the reversal
and changes by 260 30 days from 1 to 6 GeV.