Charge sign dependence of recurrent Forbush decreases in 2016-2017

被引：1
作者：
Romaneehsen, L. [1 ]
Heber, B. [1 ]
Marquardt, J. [1 ]
机构：
[1] Christian Albrechts Univ Kiel, Leibnizstr 11, D-24118 Kiel, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2024年 / 690卷
关键词：
Sun: heliosphere; Sun: magnetic fields; Sun: rotation; solar wind; COSMIC-RAY INTENSITY; COROTATING INTERACTION REGIONS; MODULATION; PARTICLES; EVOLUTION; FLUXES; PAMELA; ARINA;
D O I：
10.1051/0004-6361/202449836
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Context. This study investigates the periodicities of galactic cosmic ray flux attributed to corotating interaction regions (CIRs) using Alpha Magnetic Spectrometer (AMS-02) data from late 2016 to early 2017. Aims. We determine the rigidity dependence of recurrent Forbush decrease (RFD) amplitudes induced by CIRs for different particles with a focus on charge sign. Methods. We carried out a frequency analysis using a Lomb-Scargle algorithm and superposed epoch analysis for all particles. For protons and helium, we compared the results with a single Forbush decrease (FD) analysis. Results. Our results reveal that the rigidity dependence of proton amplitudes attributed to the northern coronal hole is in qualitative agreement with previous findings. In contrast, the amplitudes attributed to the southern coronal hole show no rigidity dependence. Furthermore, the amplitude of the helium modulation exceeds that of protons, in line with the observation for long-term modulation. For positrons, statistical limitations stand in the way of any definitive conclusions. In comparison to the positively charged particles, the modulation behavior of electrons reveals a different pattern.
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页数：17
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