Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.231102
Keywords
-
Categories
Funding
- NASA
- DOE [DE-AC02-05CH11231]
- MIT and its School of Science
- Laboratory for Nuclear Science
- Chinese Academy of Sciences, Institute of High Energy Physics, China
- Institute of Electrical Engineering, China
- China Academy of Space Technology, China
- National Natural Science Foundation, China
- Ministry of Science and Technology, China
- China Scholarship Council, China
- provincial government of Shandong, China
- provincial government of Jiangsu, China
- provincial government of Guangdong, China
- Shandong University, China
- Shandong Institute of Advanced Technology, China
- CNRS/IN2P3, France
- CNES, France
- DLR, Germany [50OO1805]
- DLR at CAU, Germany [50OC1804]
- INFN, Italy
- ASI, Italy [2014-037-R.1-2017, 2019-19-HH.0]
- ASI-University of Perugia, Italy [2019-2-HH.0]
- CHEP, Korea
- NRF at Kyungpook National University, Korea [NRF-2018R1A6A1A06024970]
- Consejo Nacional de Ciencia y Tecnologia , Mexico
- UNAM, Mexico
- NWO, Netherlands [680-1-004]
- FCT, Portugal [CERN/FIS-PAR/0013/2019]
- Ministry of Science and Higher Education , Russia [0723-2020-0040]
- CIEMAT, Spain
- IAC, Spain
- CDTI, Spain
- SEIDI-MINECO, Spain [PID2019-107988 GB-C21/C22, CEX2019-000920-S, MDM-2015-0509]
- Fondation Dr. Manfred Steuer, Switzerland
- Academia Sinica, Taiwan
- Ministry of Science and Technology (MOST), Taiwan [107-2119-M-006-015-MY3, 109-2112-M-001-029, CDA-105-M06]
- Turkish Energy, Nuclear and Mineral Research Agency (TENMAK), Turkey [2020TAEK (CERN) A5.H1.F5-26]
- NSF, USA [1455202, 2013228]
- Wyle Laboratories, USA [2014/T72497]
- NASA NESSF, USA [HELIO15F-0005]
- Direct For Mathematical & Physical Scien
- Division Of Physics [2013228] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1455202] Funding Source: National Science Foundation
- Fundação para a Ciência e a Tecnologia [CERN/FIS-PAR/0013/2019] Funding Source: FCT
Ask authors/readers for more resources
We present a precise measurement of the helium flux in cosmic rays over a span of 2824 days from May 20, 2011 to October 29, 2019. The study reveals that the helium flux and the helium to proton flux ratio show variations on multiple timescales, with the periodicities changing in strength with time and rigidity.
We present the precision measurement of 2824 daily helium fluxes in cosmic rays from May 20, 2011 to October 29, 2019 in the rigidity interval from 1.71 to 100 GV based on 7.6 x 10(8) helium nuclei collected with the Alpha Magnetic Spectrometer (AMS) aboard the International Space Station. The helium flux and the helium to proton flux ratio exhibit variations on multiple timescales. In nearly all the time intervals from 2014 to 2018, we observed recurrent helium flux variations with a period of 27 days. Shorter periods of 9 days and 13.5 days are observed in 2016. The strength of all three periodicities changes with time and rigidity. In the entire time period, we found that below similar to 7 GV the helium flux exhibits larger time variations than the proton flux, and above similar to 7 GV the helium to proton flux ratio is time independent. Remarkably, below 2.4 GV a hysteresis between the helium to proton flux ratio and the helium flux was observed at greater than the 7 sigma level. This shows that at low rigidity the modulation of the helium to proton flux ratio is different before and after the solar maximum in 2014.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available
Share Paper
