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After six years of continuous observations in space, the Alpha MagneticSpectrometer experiment has released new data on the temporal evolution of theproton and helium fluxes in cosmic rays. These data revealed that the ratiobetween proton and helium fluxes at the same value of rigidity $R=p/Z$(momentum/charge ratio) is not constant at $R\lesssim$ 3 GV. In particular, theratio is found to decrease steadily during the descending phase of Solar Cycle24 toward the next minimum. We show that such a behavior is a remarkablesignature of the $\beta\times\lambda(R)$ dependence in the diffusion of cosmicrays in heliosphere, where $\beta$ is their adimensional speed and $\lambda(R)$is their mean free path, a universal function of rigidity for all nuclei. Thisdependence is responsible for distinctive charge/mass dependent effects in thetime-dependent modulation of low-rigidity particles.

Testing diffusion of cosmic rays in the heliosphere with proton and helium data from AMS