test of validity of the force field approximation with ams 02 and pamela monthly fluxes

• DOI: 10.48550/arxiv.1910.00027
• Publication Date: 2019-08-28
• Authors: Andrew Kuhlman; Siqi Wang; Christopher Light; C. Consolandi; Christopher Freeman; Matteo Palermo; Veronica Bindi; Claudio Corti
• Keywords: High Energy Astrophysical Phenomena (astro-ph.HE); Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics; 0103 physical sciences; FOS: Physical sciences; Astrophysics - High Energy Astrophysical Phenomena; 01 natural sciences; Solar and Stellar Astrophysics (astro-ph.SR); Space Physics (physics.space-ph)

Proceeding of the 36th International Cosmic Ray Conference (ICRC19)<br/>Galactic cosmic rays (GCRs) entering the heliosphere are disturbed by the magnetic field of the Sun, which varies the shape and intensity of their local interstellar spectrum. The force-field approximation is a popular way of dealing with solar modulation, especially for studies focused on galactic transport of cosmic rays. The validity of this approach to reproduce the modulated GCR fluxes at Earth is tested using monthly proton fluxes measured by PAMELA between July 2006 and January 2014 and monthly proton and helium fluxes measured by AMS-02 between May 2011 and May 2017. We show that the precision of the new AMS-02 data requires a rigidity-dependent modification of the force-field approximation.<br/>