Abstract
The Alpha Magnetic Spectrometer has recently released a first set of precise measurements of cosmic rays detected on the International Space Station in the GeV to TeV energy range. The fluxes of positrons, electrons and protons are presented. Neither of the fluxes is compatible with a single power law. Both the electron flux and the positron flux change their behavior at ∼30 GeV but the fluxes are significantly different in their magnitude and energy dependence. Between 20 and 200 GeV the positron spectral index is significantly harder than the electron spectral index. Above ∼200 GeV the positron fraction no longer exhibits an increase with energy. The proton flux is progressively hardening above rigidity ∼100 GV. The detailed variation with rigidity of the proton flux spectral index is presented.
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