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

Journal Article · · Physical Review Letters
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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 × 10 9 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 ~ 3 GV the $$p$$/He flux ratio is time independent. We observed that below ~ 3 GV the ratio has a long-term decrease coinciding with the period during which the fluxes start to rise.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
AMS Collaboration
Grant/Contract Number:
AC02-06CH11357; 2014/19149-7; 2015/50378-5; 2016/10222-9; 707543-MAtISSE; 40361/01; 40518/03; 258963; 50OO1403; 2013-002-R.0; 2014-037-R.0; NRF-2009-0080142; NRF-2012-010226; NRF-2013-004883; PTDC/FIS/122567/2010; ESP2015-71662-C2-(1-P/2-P); SEV-2015-0548; MDM-2015-0509; RyC-2013-14660; 103-2112-M-006-018-MY3; 105-2112-M-001-003; CDA-105-M06; 2017TEAK(CERN)A5.H6.F2-15; 14255202; 1551980; AC02-05CH11231; JARA0052; HELIO15F-0005; 2014/T72497
OSTI ID:
1462300
Alternate ID(s):
OSTI ID: 1544240
Journal Information:
Physical Review Letters, Vol. 121, Issue 5; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 103 works
Citation information provided by
Web of Science

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Cited By (16)

Validation of the Neutron Monitor Yield Function Using Data From AMS‐02 Experiment, 2011–2017 journal April 2019
Fitting B/C cosmic-ray data in the AMS-02 era: a cookbook: Model numerical precision, data covariance matrix of errors, cross-section nuisance parameters, and mock data journal July 2019
Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station text January 2018
Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer text January 2019
Study of Galactic Cosmic-Ray Flux Modulation by Interplanetary Plasma Structures for the Evaluation of Space Instrument Performance and Space Weather Science Investigations journal November 2019
Numerical Modeling of Galactic Cosmic-Ray Proton and Helium Observed by AMS-02 during the Solar Maximum of Solar Cycle 24 journal February 2019
A Numerical Study of Cosmic Proton Modulation Using AMS-02 Observations journal June 2019
Modulation of Galactic Cosmic Rays from Helium to Nickel in the Inner Heliosphere journal December 2019
Deciphering the Local Interstellar Spectra of Secondary Nuclei with the Galprop/Helmod Framework and a Hint for Primary Lithium in Cosmic Rays journal February 2020
Tracking Cosmic-Ray Spectral Variation during 2007–2018 Using Neutron Monitor Time-delay Measurements journal February 2020
Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station journal July 2018
Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station text January 2018
Numerical modeling of galactic cosmic ray proton and helium observed by AMS-02 during the solar maximum of Solar Cycle 24 text January 2018
Scrutinizing the evidence for dark matter in cosmic-ray antiprotons text January 2019
Validation of the neutron monitor yield function using data from AMS-02 experiment, 2011--2017 text January 2019
Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer text January 2019

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