Observation of Fine Time Structures in the Cosmic Proton and Helium Fluxes with the Alpha Magnetic Spectrometer on the International Space Station

doi:10.1103/PhysRevLett.121.051101

	Observation of Fine Time Structures in the Cosmic Proton and Helium Fluxes with the Alpha Magnetic Spectrometer on the International Space Station
	AMS Collaboration
刊名	PHYSICAL REVIEW LETTERS
	2018
卷号	121 期号:5 页码:51101
ISSN号	0031-9007
DOI	10.1103/PhysRevLett.121.051101
文献子类	Article
英文摘要	We present the precision measurement from May 2011 to May 2017 (79 Bartels rotations) of the proton fluxes at rigidities from 1 to 60 GV and the helium fluxes from 1.9 to 60 GV based on a total of 1 x 109 events collected with the Alpha Magnetic Spectrometer aboard the International Space Station. This measurement is in solar cycle 24, which has the solar maximum in April 2014. We observed that, below 40 GV, the proton flux and the helium flux show nearly identical fine structures in both time and relative amplitude. The amplitudes of the flux structures decrease with increasing rigidity and vanish above 40 GV. The amplitudes of the structures are reduced during the time period, which started one year after solar maximum, when the proton and helium fluxes steadily increase. Above similar to 3 GV the p/He flux ratio is time independent. We observed that below similar to 3 GV the ratio has a long-term decrease coinciding with the period during which the fluxes start to rise.
电子版国际标准刊号	1079-7114
WOS关键词	GEOMAGNETIC REFERENCE FIELD ; MERGED INTERACTION REGIONS ; SOLAR MODULATION ; RAY MODULATION ; AMS-02 ; GENERATION ; SIMULATION ; DETECTOR ; CYCLE
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000440386100001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286175]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	AMS Collaboration. Observation of Fine Time Structures in the Cosmic Proton and Helium Fluxes with the Alpha Magnetic Spectrometer on the International Space Station[J]. PHYSICAL REVIEW LETTERS,2018,121(5):51101.
APA	AMS Collaboration.(2018).Observation of Fine Time Structures in the Cosmic Proton and Helium Fluxes with the Alpha Magnetic Spectrometer on the International Space Station.PHYSICAL REVIEW LETTERS,121(5),51101.
MLA	AMS Collaboration."Observation of Fine Time Structures in the Cosmic Proton and Helium Fluxes with the Alpha Magnetic Spectrometer on the International Space Station".PHYSICAL REVIEW LETTERS 121.5(2018):51101.