Charge sign dependence of recurrent Forbush Decreases in 2016

This study investigates the periodicities of cosmic rays attributed to co-rotating interaction regions (CIRs) using AMS-02 data from late 2016 to early
2017. These data enable the first-time examination of Forbush decrease amplitudes induced by CIRs, considering rigidity and charge sign dependence. The findings from the Lomb-Scargle algorithm and Superposed Epoch Analysis were compared. Results reveal that the rigidity dependence of proton decreases in the northern coronal hole aligns with existing literature, while the southern coronal hole shows no rigidity dependence. Helium modulation surpasses that of protons, in line with previous observations, while limited statistical data for positrons prevent definitive conclusions. Notably, the modulation behavior of electrons differs from that of positively charged particles.