http://arxiv.org/abs/1910.01576
We study the predictions for the p/He ratio in galactic cosmic rays according to the force-field approximation. The dependence of the time variation of p/He on the local interstellar spectrum (LIS) shape and on the mass-to-charge ratio, A/Z, is analyzed in detail. We find that, depending on the rigidity range and the sign of the spectral index of the p/He LIS ratio, the p/He time variation can be correlated or anti-correlated with the phase of the solar cycle. We show that the A/Z dependence is the most probable cause for the p/He decrease recently observed by AMS-02 after 2015 between 2 and 3 GV.
C. Corti, V. Bindi, C. Consolandi, et. al.
Fri, 4 Oct 19
38/61
Comments: Proceeding of the 36th International Cosmic Ray Conference (ICRC19)
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