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Galactic cosmic rays (GCRs) entering the heliosphere are disturbed by themagnetic field of the Sun, which varies the shape and intensity of their localinterstellar spectrum. The force-field approximation is a popular way ofdealing with solar modulation, especially for studies focused on galactictransport of cosmic rays. The validity of this approach to reproduce themodulated GCR fluxes at Earth is tested using monthly proton fluxes measured byPAMELA between July 2006 and January 2014 and monthly proton and helium fluxesmeasured by AMS-02 between May 2011 and May 2017. We show that the precision ofthe new AMS-02 data requires a rigidity-dependent modification of theforce-field approximation.

Test of validity of the force-field approximation with AMS-02 and PAMELA monthly fluxes