We present high-statistics, precision measurements by AMS of the detailed time and energy dependence of the primary cosmic-ray electron and positron uxes 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 the solar maximum has been investigated in detail by leptons alone. We report the observation of short-term structures on the timescale of months which are not visible in the positron-to-electron ux 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.
Observation of complex time structures in the cosmic-ray electron and positron fluxes by the alpha magnetic spectrometer on the ISS
Vagelli V.;Graziani M.;Tomassetti N.
2020
Abstract
We present high-statistics, precision measurements by AMS of the detailed time and energy dependence of the primary cosmic-ray electron and positron uxes 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 the solar maximum has been investigated in detail by leptons alone. We report the observation of short-term structures on the timescale of months which are not visible in the positron-to-electron ux 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
