Modulation of Galactic Cosmic Rays in the Inner Heliosphere over Solar Cycles

被引：39

作者：

Shen, Z. -N. ^{[1
,2
]}

Qin, G. ^{[3
]}

机构：

[1] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China

[3] Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 854卷 / 02期

关键词：

cosmic rays; diffusion; Sun: activity; Sun: heliosphere; turbulence; MERGED INTERACTION REGIONS; TIME-DEPENDENT MODULATION; SWEEPING SLAB TURBULENCE; MEAN-FREE PATHS; MAGNETIC-FIELD; CHARGED-PARTICLES; PERPENDICULAR DIFFUSION; TERMINATION SHOCK; WIND FLUCTUATIONS; DRIFT MODEL;

D O I：

10.3847/1538-4357/aaab64

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The 11- and 22-year modulation of galactic cosmic rays (GCRs) in the inner heliosphere is studied using a numerical model developed by Qin and Shen in 2017. Based on the numerical solutions of Parker's transport equations, the model incorporates a modified Parker heliospheric magnetic field, a locally static time-delayed heliosphere, and a time-dependent diffusion coefficients model in which an analytical expression of the variation of magnetic turbulence magnitude throughout the inner heliosphere is applied. Furthermore, during solar maximum, the solar magnetic polarity is determined randomly with the possibility of A > 0 decided by the percentage of the solar north polar magnetic field being outward and the solar south polar magnetic field being inward. The computed results are compared at various energies with several GCR observations, e.g., the Interplanetary Monitoring Platform 8 (IMP 8), EPHIN on board the Solar and Heliospheric Observatory (SOHO), Ulysses, and Voyager 1 and 2, and they show good agreement. We show that our model has successfully reproduced the 11- and 22-year modulation cycles.

引用

页数：15

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