Time dependence of the p/He ratio in cosmic rays according to the force-field approximation

30 Sep 2019 · Corti Claudio University of Hawaii at Manoa, Bindi Veronica University of Hawaii at Manoa, Consolandi Cristina University of Hawaii at Manoa, Freeman Christopher University of Hawaii at Manoa, Kuhlman Andrew University of Hawaii at Manoa, Light Christopher University of Hawaii at Manoa, Palermo Matteo University of Hawaii at Manoa, Wang Siqi University of Hawaii at Manoa ·

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.

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Time dependence of the p/He ratio in cosmic rays according to the force-field approximation

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