A Numerical Study of Cosmic Proton Modulation Using AMS-02 Observations

doi:10.3847/1538-4357/ab1b2a

	A Numerical Study of Cosmic Proton Modulation Using AMS-02 Observations
	Luo, Xi; Potgieter, Marius S.; Bindi, Veronica; Zhang, Ming; Feng, Xueshang
刊名	ASTROPHYSICAL JOURNAL
	2019
卷号	878 期号:1 页码:6
关键词	cosmic rays diffusion Sun: activity Sun: heliosphere
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1b2a
英文摘要	Since 2011 May, the Alpha Magnetic Spectrometer (AMS-02) on board the International Space Station has provided monthly cosmic proton fluxes for various low-rigidity levels (P < 50 GV). These precise measurements, in terms of high time and rigidity resolution, have provided a good opportunity to study cosmic ray modulation over a wide range of rigidities, together with transient events. Subsequently, a comprehensive numerical transport model has been constructed, based on Parker's transport equation that includes all known physical mechanisms: diffusion, convection, drift, and adiabatic cooling. Propagating diffusion barriers to simulate Forbush decreases (Fds) and global merged interaction regions (GMIRs) have also been incorporated: (1) utilizing a time-varying tilt angle of the heliospheric current sheet and interplanetary magnetic field, the general trend of the time variation of cosmic proton fluxes has been reproduced; (2) the Fd events in 2011 October and 2012 March have been simulated, and the first GMIR event in solar cycle 24 has also been simulated and studied; and (3) the rigidity dependence of the proton fluxes, as revealed by the AMS-02 data, has been reproduced with the appropriate chosen rigidity dependent diffusion coefficients. In order to reproduce the proton observations, we find that apart from the transient events, the derived mean free paths in interplanetary space also need to be changed with time.
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/7043]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Luo, Xi,Potgieter, Marius S.,Bindi, Veronica,et al. A Numerical Study of Cosmic Proton Modulation Using AMS-02 Observations[J]. ASTROPHYSICAL JOURNAL,2019,878(1):6.
APA	Luo, Xi,Potgieter, Marius S.,Bindi, Veronica,Zhang, Ming,&Feng, Xueshang.(2019).A Numerical Study of Cosmic Proton Modulation Using AMS-02 Observations.ASTROPHYSICAL JOURNAL,878(1),6.
MLA	Luo, Xi,et al."A Numerical Study of Cosmic Proton Modulation Using AMS-02 Observations".ASTROPHYSICAL JOURNAL 878.1(2019):6.